Preparing your hoophouse for fall and winter

December lettuce and spinach in our hoophouse. Photo Wren Vile

Recently I traveled to Fayetteville, Arkansas to give my presentation Extend Your Growing Season into Colder Weather with High Tunnels. Run the mouse over the slide and click on the lower left.

CAFF - Extend Your Growing Season into Colder Weather with High Tunnels

We are getting ready for fall and starting to plant our winter crops in the hoophouse.

I have written about transition to winter crops here: Planning and Growing Winter Hoophouse Vegetables (August 16, 2022). This post includes a bed plan, and links to lots of related posts, such as selecting and planning winter crops, bed prep, direct sowing and transplanting, and then caring for the crops, optimizing use of the space, harvesting, and what to do if something goes wrong,

Fall Lettuce Transition

From September 11-17 we sow to transplant in our greenhouse, and on September 15 and 24 to transplant in our hoophouse. This is our fall transition and I’ll write about that when the time comes.

On September 15 and 24, we sow leaf lettuces and romaines in an outdoor nursery bed. We transplant these into our hoophouse at 10” (25 cm) spacing. This is a bit closer than the 12” (30 cm) spacing we use outdoors. We will harvest outer leaves from the hoophouse lettuce all winter, so the plants won’t get as big as they do outdoors.

Beautiful baby lettuce mix in our hoophouse in February.
Photo Wren Vile

On October 23 we start sowing lettuce mix in the hoophouse. Baby lettuce mix can be ready in as little as 21 days from mid-spring to mid-fall, longer in colder weather. Our first sowing will be harvestable form 4 December to 15 May if we’re lucky, although if it gets too hot, this planting will get bitter and we’ll need to pull it up.

Baby lettuce mix is a direct-sown cut-and-come-again crop, the plants regrow and can be harvested more than once in cool seasons. We sow 10 rows in a 4’ (1.2m) bed, 4.5” (11cm) apart. Weed and thin to 1″ (2.5 cm). When 3″–4″ (7.5–10 cm) tall, cut 1” (2.5 cm) above the soil. Gather a small handful in one hand and cut with using large scissors. Immediately after harvesting, weed the just-cut area so the next cut won’t include weeds. Rake after harvest with a fine leaf rake to remove outer leaves and cut scraps. If you want to make more than one cut, you will need to remove anything that isn’t top quality salad while you can see it. Larger scale operations have harvesting machines.

We make four or five sowings of baby lettuce mix, sowing our last one on 15 February, for harvest starting mid-March, and ending in May when it gets too hot. By then we should be happily harvesting juicy lettuce heads outdoors and will have lost interest in the lettuce mix.

The soil temperature range for germination of lettuce seeds is 35-85°F (2-29°C), with 40-80°F (4-27°C) being the optimum range and 75°F (24°C) the ideal. At 41°F (5°C) lettuce takes 15 days to germinate; at 50°F (10°C) it takes 7 days; at 59°F (15°C) 4 days; at 68°F (20°C) only 2.5 days; at 77°F (25°C) 2.2 days. Then time to germination increases: 2.6 days at 86°F (30°C); after that it’s too hot.

Removing Shadecloth from our Hoophouse

We are now removing our shadecloth. Normally we would have removed the shade cloth in mid-September, or at least by the Equinox, but this year we are delayed a week. After 15 years with our initial piece of shadecloth we ordered a new piece. Well, we ordered two new pieces, because we mistakenly ordered a piece only half long enough. We bought a matching piece for the other half, and this winter we are going to sew the two pieces together with nylon twine, because the ends of each piece roll back, leaving a central gap about 6 feet long by September. Measure twice, order once!

Our hoophouse with two pieces of shadecloth (by mistake). Photo Pam Dawling

Before next spring we need to replace quite a lot of the hooks the shadecloth ropes attach to. Next time we replace the big plastic we also need to replace the baseboards, as they are rotting and not holding the hooks well.

My post Fall hoophouse bed prep and shadecloth removal includes spreading compost, broadforking, and a step-by-step guide to hoophouse fall bed prep.

Also see September in the Hoophouse for more about removing shadecloth

A reader passed on this tip:When I ordered shadecloth for my hoophouse, I overshot each end by ten or twelve feet. We stake that out on either end, using six-foot T-posts, to give us a shaded area where air moving into the hoophouse’s open ends can be cooled before entering the structure. Every year in July and August, I’m grateful we did.”

Washing Down the Salts in the Hoophouse

Effects of excess soil salt levels on crop foliage.
Photo Rose Ogutu, Horticulture Specialist, Delaware State University

Next week we will leach the salts that have risen to the surface of the soil and dried out there. My book The Year-Round Hoophouse has a whole chapter on recognizing, monitoring and reducing salts that have built-up in the hoophouse, and reducing the likelihood of problems in the future. There is also a chart of salt tolerance of various vegetables, so you can choose what to grow while you remediate your soil. Here I’ll just give a very short intro, in three slides. Click in the lower left of the first slide to move to the next one.

Salt Build-up

Closing Hoophouse Doors and Windows at Night

We are starting to close the doors at night when the temperature looks likely to drop below 50°F (10°C) outside. We had to trim down the grass to be able to push the doors to. We had to re-drill the holes the door-bolts (“cane bolts”) go down into. The doors have been wide open all summer.

View through the hoophouse doors in December.
Photo Kathleen Slattery

In fall/winter/spring, if night time outdoor low temperatures will be below 40°F (4.5°C) here, we close the windows as well as the doors.

See my post Hoophouse Sliding Doors if you might want to replace your doors with sliding ones.

One of the sliding doors on our hoophouse.
Photo Pam Dawling

Be Ready for Winter

See my post Dealing with winter weather in your hoophouse (Jan 2022). Be ready to deal with snow and strong winds, extra cold temperatures, and holes in the plastic letting cold air in. If you have a double layer hoophouse, the air inflated between the layers adds strength to the structure, as well as thermal insulation. Holes are bad news.

Hoophouse snow scraping tool on a telescoping painter’s pole. Photo Pam Dawling

Winter Kit

  • SnoBrum and telescoping painter’s pole
  • Hat with visor
  • Long-handled broom with bristles covered with a towel or some bubblewrap
  • Rowcover or inner tunnels
  • Some spare plants, back-up plans or a list of fast-growing crops to replace disasters with successes.
  • PolyPatch tape for fixing holes in the plastic
  • Gorilla tape for fixing many problems
  • Pond noodles or other draft-excluding sausages if your doors let air under them
  • Perhaps some sturdy poles or 2x4s to help support the roof in case of very heavy snow.
  • Hot chocolate/tea/coffee for when you get back indoors.
Plan D: seed flats in our hoophouse on Oct 16, a late attempt to make up for things that went wrong!
Photo Pam Dawling

Nematode-resistant food crops and cover crops

Golden Frills and Scarlet Frills, two Juncea mustards that resist nematodes. Photo Pam Dawling

A few weeks ago I wrote about clearing tomato plants, and mentioned our hoophouse troubles with nematodes. Nematodes are tiny soil-dwelling worms that have a wide host range and are hard to control. They move only 3’–4′ (1–1.2 m) per year on their own, but people move them on shoes, tools, etc. We have had peanut root-knot nematodes (Meloidogyne arenaria) since 2011 when we found them in spinach transplants we were growing for outdoors in early spring.

My article on nematodes in Growing for Market  in November 2014 describes our discovery of the beasties and our first attempts to deal with them.

White Russian kale in our hoophouse.
Photo Pam Dawling

In my August 2014 post Good news – great hoeing weather! Bad news – more nematodes in the hoophouse I wrote about solarization to fight nematodes in our hoophouse (scroll down to the end of the post). The post includes a photo of our first attempt at solarizing – a  bit of a How Not To! Be sure to use UV-inhibited polyethylene. This year we somehow got some construction plastic mixed in. It doesn’t work! It goes cloudy (thus not heating up the soil) and it shatters into little pieces.

There is info on dealing with nematodes from Garry Ross in Hawaii, where nematodes are a fact of daily life, in my post Cold weather, snow, thinking about nematodes from February 2015.

My most thorough blogpost about nematodes was in 2018 for Mother Earth News:  Managing Nematodes in the Hoophouse.

Solarizing with clear plastic. Photo Pam Dawling

My post Solarization and crop choices to fight nematodes in August 2019 includes a photo of a much better way to solarize an individual bed. In that post I gave a list of nematode-resistant food crops, and also talked about cover crops. There is a photo of nematodes on cucumber roots there too).

Food crop choices to fight nematodes

Most resistant and most helpful are the Juncea group of mustards. I did some research into more Juncea options in Solarization and crop choices to fight nematodes. We don’t like very pungent greens, so we have not yet taken the route of planting a whole bed of Juncea types. Instead we have mapped and flagged the nematode-infested areas of our beds, and try to be mindful of what we plant in those spots. Three of our seven beds have no nematodes so far.

Open-pollinated Yukina Savoy.
Photo Ethan Hirsh

This year we looked at the nematode map we had made and decided to focus our attention on the bed with the highest number of nematode patches, and grow the most resistant winter crops (of the ones we like to grow) there. That’s the frilly mustards (Ruby Streaks, Scarlet Frills, Golden Frills, all Juncea mustards, and Mizuna, a Japonica mustard), Yukina Savoy (variously reported to be Brassica juncea,  Brassica rapa pekinensis, and Brassica rapa), and Russian kales (Brassica rapa).

Mapping nematode areas

See the post with info from Gerry Ross I mentioned above. We have previously tried for a “Two years good, One year bad” strategy. This was to grow nematode-resistant crops in the infected areas for two years, then try risking one year of susceptible crops. That was a bit demanding on careful management, and we haven’t kept that up.

Nematode map 2022

Cover crop choices to fight nematodes

French marigolds and sesame to deter Root Knot nematodes in our hoophouse. Photo Pam Dawling

A reader asked about cover crop choices to fight nematodes. In June 2019 I wrote about using marigolds, sesame, Iron and Clay cowpeas as warm-weather nematode resistant cover crops. We’ve also used winter wheat (in winter!), and white lupins (not worthwhile, in my experience). See that post for a few other ideas on nematode-fighting cover crops, and why we decided against some options. At that time, we decided not to grow sunnhemp (Crotolaria) because it is poisonous, although newer varieties of Crotolaria have lower toxin levels. More recently we have been growing sunnhemp, after I saw it growing so well in North Carolina. It is a warm-weather legume, so it is feeding the soil while tackling the nematodes. It does grow tall in the hoophouse, and we have taken to chopping it down with hedge shears to an ergonomic elbow-height every few weeks whenever it gets too tall. The cut tops create a nice “forest-floor” mulch effect. You can almost feel the extra organic matter nurturing the soil! (High OM levels deter nematodes.) 60-90 days to maturity.

Sunnhemp cover crop at Nourishing Acres Farm, NC.
Photo Pam Dawling

We previously used soybeans as a short-term leguminous summer cover crop, but they do not offer the nematode resistance. Iron and Clay, Mississippi Silver and Carolina Crowder cowpeas are all nematode-resistant and can be grown in summer instead of soybeans. Sesame is a legume that is particularly good against peanut root-knot nematodes.

Iron and Clay southern peas flowering in September. Photo Pam Dawling

See Our Organic Integrated Pest Management post for an organized approach to pest management, including nematodes.

A Florida reader gave me information about partridge peas, which I have not yet tried: After terminating cool-season brassicas and celery between April and June, their late spring sowing of partridge peas were too late this year to be productive, because the hard seed was very slow to germinate. Partridge pea could be a good cover crop for mid- to late-summer, if you scarify those hard seeds to speed germination.

Some cover crops can be alternate hosts for pathogens like cercospora, rust, or bacterial leaf spot, so be on the lookout for new problems while solving old problems. In the deep south, beans, yard-long (asparagus) beans, and cowpeas can succumb to heat, nematodes, rust, bacterial spots, and other pathogens and pests. Senna (tall) and Partridge pea can provide “chop-and-drop” organic matter as sunnhemp does. Sunn Hemp can host foliar pathogens (some possibly seed-borne), in Florida, and does not reliably form nitrogen-fixing nodules on the roots, even when inoculated. Even so, it is useful as a fast warm season green manure cover.

The flower Gaillardia (blanket flower) is a quick-to-compost, chop and drop option for late winter to late spring, It decomposes quickly, and can provide a quick green manure. Gaillardia is nematode-resistant, great for beneficials and pollinators, but is susceptible to some foliar pathogens later in the season. You can sow Gaillardia in August, or even later in fall for early spring flowering.

Due to climate change, and the more year-round activity of nematodes, pathogens, and pests in Florida, they’ve been including more nematode-resistant grasses into their rotations. We all need to be thinking more about warmer-climate options, as climate change continues to push pathogens and pests farther north, earlier each year.

Fruit for the Month: September (Watermelon)

 

Crimson Sweet watermelon.
Photo Nina Gentle

This is another in my monthly series of posts about small fruits that can be grown sustainably in a (loosely-speaking) mid-Atlantic climate. I cover planting, pruning, harvesting and care of the plants, according to the season. I’ll give links to useful publications. We have a focus fruit, and then more about others that need attention during the month.

Watermelons are the focus fruit for September

Nothing beats a big slice of watermelon during a break from working in the fields. It’s a good cure for dehydration, especially if lightly salted to balance the electrolytes, and helps improve heat tolerance. It’s good to know watermelon are nutritious, but frankly, their main claim to fame is that they are delicious, and just about everyone wants one when the weather is hot.

Crimson Sweet Virginia Select watermelon.
Credit Southern Exposure Seed Exchange

I’ll start with information on harvesting, and pests and diseases to watch out for, then cycle round to things to think about for next summer’s watermelon crop.

Watermelon harvest

Ripe watermelons have mature seeds. In Crimson Sweet these are brown-black. White seeds indicate an under-ripe melon.
Photo Pam Dawling

The skill of the harvester in discerning ripeness is a major factor affecting the taste. The first sign we look for is the shriveling and browning of the tendril on the vine directly opposite the little stem of the watermelon. If this tendril is not shriveled we walk on by. Next we slap or knock on them.

According to Southern Exposure Seed Exchange, when a watermelon is ripe, it will have a hollow sound when you thump it with your knuckles: it sounds like thumping your chest. If it sounds like knocking your head, it’s not ripe; if it sounds like hitting your belly, it’s over-ripe. There is a 10-14-day period of peak ripeness for each variety. We harvest our Crimson Sweet from around 7/25 (75 days from transplanting) to the end of August. We might be still harvesting in September.

Lastly, we do the “Scrunch Test”: put two hands (heels together) spread out across the melon, press down quite hard, listen and feel for a scrunch – the flesh in the melon is separating under the pressure. Rumor has it that it only works once, so pay attention!

Other growers with other varieties use different ripeness signs, such as the change in color of the “ground spot” (the area touching the ground), or the change in rind texture from glossy to dull.

I like to cut the melon stems with pruners, but some people break them off. Watermelons need gentle handling, as do the vines if you will be returning to harvest again. After harvest, we set the melons out to the side of the row for pickup. This gives time for sap to start to ooze out of the cut stem. If the sap is red or orange, the melon is ripe. If it is straw-colored, the melon was cut too soon. This is useful feedback for new crew.

Post-Harvest Storage of Watermelons

Watermelon marked with a grease pencil.
Photo Nina Gentle

Watermelons can store for a few weeks, but then flavor deteriorates. We store ours outdoors in the shade of a building or a tree. Rotating the stored stock is a good idea. (Consider dating them with a grease pencil/china marker). The ideal storage temperature is 50-60°F (10-15.5°C), with 90% humidity.

Watermelon Pests

Compared to some crops, watermelons are not often challenged by many pests.

  • Striped cucumber beetles are our worst pest. They eat not only the leaves (which reduces the sweetness of the melons) but also the rind of the melons, leaving an unattractive russeted surface, thinner than it was originally, and easily damaged. Cucumber beetles can also interfere with fruit set by eating the stamens and pistils of the flowers. Don’t worry unless you see two beetles or more per plant.
  • Aphids (usually green peach aphids) can be a problem to young plants – another reason to use rowcover or fine mesh netting. If needed, use insecticidal soap, or import ladybugs or lacewings.
  • Spider mites can be a problem in hot dry weather if populations are driven into the patch by mowing of bordering grassy areas. Heavy rain, vigorous spraying with water or overhead irrigation will reduce numbers.
  • Root knot nematodes can attack roots and produce galls. This leads to loss of vigor and wilting.
Striped cucumber beetle in squash flower. Photo Pam Dawling

Watermelon Diseases

Organic growers do not usually get many disease problems with watermelon, provided the soil fertility is well-balanced and the plants are not physically damaged. There are a few diseases to watch for:

  • Alternaria leaf spot
  • Cercospora leaf spot
  • Gummy stem blight
  • Watermelon fruit blotch/bacterial fruit blotch is a serious seed-borne disease
  • Bacterial wilt – watermelon is resistant, although young seedlings could succumb.
  • Fusarium wilt is a persistent soil-borne fungal disease that infects the roots, invading the xylem cells.
  • Anthracnose is a fungal foliar disease that can cause loss of vigor and fruit spotting.

Check the Oklahoma State University Watermelon Diseases publication for help identifying diseases.

Planning Watermelon Varieties for Next Year

 After trying several varieties, we settled on Crimson Sweet, a 20-25 lb (9-11 kg) striped 10 x 12” (25 x 30 cm) oval OP melon which takes 86 days from transplant to harvest. It has tolerance to some strains of Anthracnose and Fusarium. Its flavor is the best! For many years, I saved the seed, selecting for size, earliness, disease resistance and flavor. This is available from Southern Exposure Seed Exchange, as Crimson Sweet, Virginia Select.

Crimson Sweet, Virginia Select watermelon seed collection.
Photo Pam Dawling

Charleston Gray is another popular large variety, with a redder color but less sweetness than Crimson Sweet. Black Tail Mountain (OP, 73 days) was made famous by Glenn Drowns, who developed it as a fast-growing, highly productive, rich flavored melon he could grow in a cold climate in northern Idaho. It stores for up to 2 months after harvest. OrangeGlo (85 days) is an outstanding orange-fleshed variety, with large fruits and great tropical flavor.

“Icebox” varieties are 6” (15 cm) round, 8-12.5 lbs (3.6-5.7 kg) melons, perfect for small refrigerators. Some varieties are ready as soon as 64 days after transplanting. Seedless triploid varieties Dark Belle (F1 75d) and Fun Belle are said to be better tasting than traditional Sugar Baby (77d) and orange New Orchid (80d). But triploid seedless watermelon seed is expensive and harder to germinate, and the transplants are very fragile and tricky to establish. Triploid varieties are hybridized from a cross between two plants with incompatible sets of chromosomes. This results in sterility (lack of seeds).

Even smaller than the icebox size are “mini” watermelons, 3-6 lb (1.4-2.7 kg). Golden Midget is an OP seeded mini from Baker Creek 70d, 3 lbs (1.4 kg). There are also triploid seedless varieties. Solitaire (triploid, 88d), is a single serving watermelon from Johnny’s. It has 6” (15 cm) diameter fruit. Harvest can begin 78 days after transplanting.

I’ll do a blogpost on growing watermelons next spring, once you might be sowing the seed, or at least planning your garden layout.

Other small fruits still available in September

Asian melons, Asian pears (must ripen on the tree), Asian Persimmons, Blackberries, Figs, Muscadine Grapes, Muskmelons, Pawpaws, Fall raspberries, Rhubarb.

Asian melons and muskmelons will only be available if you made a second sowing in June!

Other small fruits becoming available in September

Kiwiberries (Actinidia arguta, aka hardy kiwi, Chinese kiwi) and elderberries. American persimmons need to be soft before they’re nice to eat. This can be anywhere between September and February. If the wildlife are not going to wait for them to ripen, harvest them early and let them ripen indoors.

Sun Jewel Asian melon. Photo Mary Kranz

Other fruit care in September

Mow aisles, weed and water all fruit (weed blueberries and raspberries shallowly, so as not to damage roots).

Prepare and plant new strawberry beds in early September if not done in late August, using potted runners. If needed, use rooted runners from the paths of an old patch to fill gaps. Renovate strawberries to carry over for next season, if not already done.

Farmer and gardener health and wellness

A crew member string-weaving peas in our hoophouse in February. Photo Wren Vile

Raising food is good work, right livelihood, outdoor work in the rain, sunshine and fresh air. The physical tiredness at the end of the day can bring good sleep. Farmers contribute to production of healthy food, and get to enjoy extremely fresh food from very local farms.

And yet – some days this is not the whole story. Farming can be hard on the body, the brain and the emotions. It can be stressful trying to get a good outcome from a situation that went outside our control and took a turn for the worse. Some things we can control, others we cannot. Some things we will be able to do a better job of dealing with next time they come around. Our work is not punching out identical widgets. Seasons change, tasks change. Only for a short time each year do we need to know how to decide if a watermelon is ripe. Once in a hundred years we need to know how to deal with a one-hundred-year flood (hmm!). I have written about being prepared for and dealing with disasters in The Year-Round Hoophouse. Being prepared and having a plan of what to do when things go wrong is a very good way to manage mental and emotional stress.

Hauling sweet potatoes uphill the hard way. Sometimes we use the truck!
Photo Nina Gentle

Musculoskeletal health

First let’s talk about physical health of the musculoskeletal kind. Overdoing the hard work, making the wrong move, going beyond the limits of our bodies, and wow! Pain! Maybe even injury. After many repeats of the same action, inflammation and problems such as carpal tunnel syndrome, and over time, maybe arthritis too. Musculoskeletal pain affects bones, joints, ligaments, tendons or muscles. See the Cleveland Clinic information page.

Common symptoms include aching, stiffness, burning sensations in the muscles, fatigue, muscle twitches, pain that worsens with movement and sleep disturbances.

Home treatment can include hot and cold compresses, over-the-counter pain relievers (NSAIDs), strengthening and conditioning exercises, stretching exercises, and stress reduction techniques.

Professional treatments can include local injections with anesthetic or anti-inflammatory medications, physical or occupational therapy, acupuncture or acupressure and relaxation/ biofeedback techniques. Most people I’ve seen at physical therapy are there for sports injuries. Sports medicine offers many good exercises for people whose work has injured their bodies.

Prevention is definitely better than cure. I’m a firm believer in doing some stretches and strengthening exercises every morning. Yoga is great too. Going to the gym? Some farmers make time for this, others don’t. Here’s some more prevention tips: limit repetitive movements, or vary them, use good posture and practice correct lifting techniques. (I recommend the Alexander Technique). Alexander Technique teachers help you identify and change harmful habits of posture and body use, and learn to move more freely.

I have written some articles in Growing for Market magazine that are accessible for those with a Full Access subscription on the website. I wrote about stretching in April 2008. Julie Bradley Law wrote an article: A wintertime reset for our most important tool: our bodies. It is free to access, and recommends a few weeks of winter rest, yoga and attunement. Designed by a farmer.

AgrAbility Tool Box

For those with limited physical abilities, AgrAbility provides Assistive Technology, Resources, News, Training, Services in your State. The Toolbox: Agricultural Tools, Equipment, Machinery & Buildings for Farmers and Ranchers with Physical Disabilities is a resource that contains assistive technology solutions for farmers, ranchers, and other agricultural workers with disabilities.

Physical illness

Remember to get checkups. Be aware of ticks, mosquitoes, and rodents and the pest-borne illnesses they can cause. Read about Public health issues caused by pests. The EPA, the Centers for Disease Control and Prevention (CDC), and the U.S. Department of Agriculture (USDA) have collaborated to create a thorough List of Pests of Significant Public Health Importance

Pests and diseases and climate change: as the climate chaos intensifies pests will move into new geographical ranges. We need to learn about the Zika virus, (cases in Florida and Texas in 2016-17, but none in the continental US since then). Chikungunya is another mosquito-borne virus. In 2014 and 2015, a few local-transmission chikungunya virus disease cases were found in Florida, Texas, Puerto Rico and the U.S. Virgin Islands. Most of the cases in the US are travelers returning from countries where the disease is endemic.

Internal physical trouble

Let’s keep in mind the symptoms and treatment of heat stress. Heat stress happens when your body can’t cool itself enough. Physical activity during very hot, humid weather, and insufficient replacement of water and electrolytes cause heat stress. It can lead to heatstroke, which is a serious, life-threatening condition.

Home-made rehydration solution

Here is our recipe (“salty lemonade”):

  • 8 oz water
  • 8oz fruit juice (or mix concentrated lemon juice to usual lemonade strength)
  • A pinch (1/8 tsp) salt
  • 2 pinches (¼ tsp) baking soda

During watermelon season, a plate-sized slice of watermelon seems to do the trick!

Crimson Sweet Virginia Select watermelon.
Credit Southern Exposure Seed Exchange

At the other end of the risky weather is extreme cold, especially if it is wet and windy. Livestock farmers are more at risk of hypothermia, trying to save their animals under terrible conditions. Vegetable farmers don’t suffer the same degree of risk.

Our lungs are vulnerable to dusts, pollen, sprays, toxins, microbial pests like the Coronavirus, flu, prions (mad cow disease) and anthrax.. Good masks can guard against all these, as well as asthma and allergies. There are also some specific agricultural problems like farmers’ lung, an allergic disease usually caused by breathing in the dust from moldy hay, or other moldy crop.

Mesothelioma

You may remember hearing about problems with vermiculite in some potting mixes. Some vermiculite naturally includes asbestos. Farmers are at risk of exposure to asbestos through contaminated soil, vermiculite and dust from these products on farm equipment. The Mesothelioma Center provides free information: books, packets and a Patient Advocacy program that works with people individually to help them find local treatment, legal help, and support groups. If you may have been exposed to asbestos they help you find free care and support. They will send you a free printed guide to mesothelioma. Sign up at their website.

Mesothelioma Info pack

The site has a special section for farmers: Farmers and Asbestos.

Mental health

New Mental Health Resources for Farmers in Stressful Times

by Matt Kneece, CFSA South Carolina Policy Coordinator Aug. 5, 2022

“However rewarding, the farming lifestyle often brings a compounding mental load that can be difficult to deal with. Fortunately, the stigmas around mental health and farm stress are breaking down, and farmers don’t have to deal with it alone. . . There are loads of resources to support producers’ physical health, but programs to support mental health are just as critical.”

South Carolina Farm Bureau is now offering access to a new program called AgriWellness including three online counseling sessions free of charge.

North Carolina Agromedicine Institute has compiled a list of resources here.

Another great resource is available through Rural Advancement Foundation International – USA, which offers a crisis hotline for farmers. When crises begin piling up, one of the most important things farmers can do is reach out for help as soon as possible. RAFI-USA’s hotline is designed to be a type of rapid-response available for farmers who need to talk to someone on short notice.

“Farming is a challenging job that can easily be impacted by factors beyond farmers’ control,” said Lisa Misch of RAFI-USA. “Anything from crop failure, natural disasters, market price changes, or family emergencies could lead to a farm crisis. If you are in crisis and need someone to talk to, please call toll-free at (866) 586-6746. The hotline is open Monday through Friday from 9 a.m. to 6 p.m.ET” They also provide in-depth assistance from a farmer advocate if you are in danger of losing your farm and/or home.

“In addition to the new therapeutic resources featured above, mental health experts have recommended several tips to farmers dealing with farm stress. Pursuing a healthy diet, staying active, cultivating social support, and getting enough sleep are all great steps toward protecting your mental health.”

I hope you will never need it, but if you get to that point, call the National Suicide Prevention Hotline at 1-800-273-TALK (8255) or 1-800-799-4889 (deaf/hard of hearing) or text 741741 to the Crisis Text Line.

New 988 Suicide and Crisis Lifeline. Dial just 988. Available 24 hours. English or Spanish. Learn more The 988 Suicide & Crisis Lifeline is a United States-based suicide prevention network of over 160 crisis centers that provides 24/7 service via a toll-free hotline with the number 9-8-8. It is available to anyone in suicidal crisis or emotional distress.

Veterans Crisis Line
https://www.veteranscrisisline.net/
1-800-273-TALK (8255), press ‘1’ Text 838255 Chat also available

The American Foundation for Suicide Prevention has info on warning signs, how to have a conversation with a loved one you are concerned about, suicide loss, and more.

SC Farm Stress Management Resource Guide

I’ll leave you with this Clemson University Cooperative Extension Service link to Farm Stress Management Resources. There are educational resources, worksheets, articles, podcasts, links to support organizations, and other stress management websites.

I also took part in an interview with Jordan Marr for a podcast with The Ruminant: Audio Candy for Farmers, Gardeners and Food Lovers. It’s about farmers’ struggles with mental health problems, trying to cope with the many and varied stresses, while the public wants farmers to appear competent and blissful with all that time in the Inspiring and Nurturing Outdoors.

The Farmers Aren’t All Right. Podcast from the Ruminant. Episode 92.

Facebookhttps://www.facebook.com/theruminant/posts/1369936529736669

Planning and Growing Winter Hoophouse Vegetables

 

Hoophouse winter greens.
Photo Kathleen Slattery

If you have a hoophouse, you may now be planning or planting crops for fall, winter and spring. If you don’t have a hoophouse, this is a good time of year to consider getting one. See Twenty Benefits of Having a Hoophouse at the end of that post. There are grants available from NRCS, including reparation levels of funding from traditionally underserved groups of people. There are now companies that will construct your hoophouse for you, if you don’t want to do it yourself, or can’t. If you do want to build your own, there are detailed instructions in my book The Year-Round Hoophouse. You can buy the book here on my Books page direct from me, or from my publisher New Society, or you can buy it wherever books are sold.

The Year-Round Hoophouse cover

I have many posts about winter hoophouse vegetables, so rather than try to write something completely new on the topic, I am going to give you a guide to find your way around the information already here.

General Hoophouse Info

Winter hoophouse growing

Hoophouse video interview

Year-Round Hoophouse Vegetables slide show

Hoophouse Cool Season Crops slideshow

Hoophouse Many Crops slideshow

Hoophouse Bright Lights chard in winter.
Photo Wren Vile

Hoophouse Crop Planning

Planning winter hoophouse crops

Hoophouse Crop Rotations

Preparing for spring, sowing seeds, planning

Hoophouse Greens Clearance, Warm Weather Crops Established

Hoophouse Crops Winter 2022-2023

Hoophouse Bed Prep

Hoophouse fall bed prep

Fall hoophouse bed prep

Hoophouse bed broadforked to loosen up slumped soil. I’m happy to say our soil structure has improved in the 18 years since this photo was taken!
Photo Pam Dawling

Choosing Hoophouse Winter Crops

(see also my post categories on the right side of the computer screen, for special posts on Asian Greens, Cooking greens, lettuce and root crops)

How to decide which vegetable crops to grow

Winter-Kill Temperatures of Cold-Hardy Vegetables 2021

Spinach variety trial conclusions

September in the hoophouse: sowing spinach

Young spinach seedlings.
Photo Pam Dawling

Sow onions in a hoophouse

Frilly Mustards in our Winter Hoophouse

Three cheers for Ruby Streaks!

Yukina Savoy in the Hoophouse

Cooking Greens in December

Cooking Greens in February

Cooking Greens in March

Yukina Savoy in the early morning mist.
Photo Wren Vile

Asian Greens in October: Yukina Savoy, Tatsoi

Asian Greens for December: Pak Choy

Asian Greens for January: Chinese Cabbage

 

Green Panisse and red Revolution lettuce in our hoophouse in November.
Photo Pam Dawling

Lettuce All Year in a Changing Climate

Year Round Lettuce

Lettuce growing in October

Lettuce in December

Lettuce varieties for January

Early Lettuce Production

Cold-tolerant lettuce and the rest

Tango lettuce from our September 24 sowing on January 10.
Photo Pam Dawling

Planting in the Hoophouse (Both Transplanting and Direct Sowing)

The decision between transplanting and direct sowing

Sowing hoophouse winter crops

Seedling winter crops

Starting Seedlings

Bare Root Transplants

September sown White Russian kale (transplanted in October).
Photo Wren Vile

Keeping Every Hoophouse Bed Fully Planted and Productive

Using all the space in the winter hoophouse

Fast Growing Vegetables

Sequential Planting slideshow

Young Tokyo bekana transplant in our hoophouse .
Photo Pam Dawling

Caring for Hoophouse Crops

What makes vegetable crops bolt and how can I stop it?

You don’t want this! Bolting lettuce outdoors in July
Photo Alexis Yamashita

What to Do If Something Goes Wrong with Your Hoophouse Crops

Back-up plans for winter hoophouse crops

Plans A-D

Emergency back-up seedlings for the hoophouse.
Photo Pam Dawling

Harvesting in the Winter Hoophouse

Winter hoophouse harvests

Mid-winter hoophouse harvests

This winter week in the hoophouse

Young greens in the hoophouse

Winter Harvests

Making baby salad mix

Beautiful baby lettuce mix in our hoophouse.
Photo Wren Vile

Book Review: Cold-Hardy Fruits and Nuts by Levy and Serrano

Cover of the book Cold-Hardy Fruits and Nuts

Book Review: Cold-Hardy Fruits and Nuts: 50 Easy-to-Grow Plants for the Organic Home Garden or Landscape, by Allyson Levy and Scott Serrano. Chelsea Green, March 2022, 384 pages, 7” x 10”, 250 color photos, extensive resources, $34.95.

ADDENDUM 7/27/22: Since writing this review I have heard that some of the plants that are not invasive in New York’s Hudson Valley are invasive elsewhere, so if you have any doubt at all, please check with your local Extension Service.

This book is a delight for the landscaper, plantsperson, and fruit connoisseur. Here are profiles of 50 fruits and nuts, almost certainly including at least one or two you haven’t heard of. Che, akebia, medlar, schisandra. . . they are all resilient, low-maintenance cold-hardy plants for growing in temperate zones. And growing trees is, as Eric Toensmeier points out “one of the world’s highest-carbon forms of gardening and farming.”

The authors are the founders of the Hortus Arboretum and Botanical Gardens in New York’s Hudson Valley, a garden they created to provide inspiration for their work in visual arts. As the garden grew to 11 acres, their main passion evolved into growing and selling ornamental and edible plant collections with a focus on underutilized species, and sharing their gardens with the public through classes and open days.

Cold-Hardy Fruits and Nuts does not include apples, peaches, and other popular fruits that are actually a challenge to grow sustainably (although pears are included). This book assumes you will find basic cultivation advice from some other source, and instead focuses on specific details about each plant that you might not have seen anywhere else. The authors’ goal is to increase diversity for reasons of climate resilience and support for insect species.

The plant profiles include taste ratings, recommended cultivars, propagation methods, requirements for soil, sun, shade and fertilization, and notes on harvesting and eating; also a Growth Difficulty Rating alerting readers to the level of attention (low, lower and lowest!) that the plants will require once established. The crops in this book are disease-resistant and pest-resistant. Many of the plants have a photo page with bark, blossom, leaves and fruit at various stages of development. The fascinating plant descriptions and natural histories will keep you entranced on rainy days. I found myself wishing for a calendar of fruiting dates, to plan year-round fruit. Although not presented in that format, the information is in each Taste Profile and Uses section.

The first fruit is akebia, also known as chocolate vine. It is an attractive ornamental, and if you want fruit, you need two genetically different plants. Akebia is easy to grow and thrives on neglect. It could be invasive, although the authors have not found it so. The 3-5” (7.5-13cm) fruit look like purple sausages with a waxy bloom. When ripe, the fruits split open showing white pulp enclosing tiny black seeds. The taste is like coconut-flavored tapioca pudding.

The second plant is the familiar almond. If you have disease problems with peaches, plums or cherries, think twice. If you have room for a few large trees, consider growing a few Dunstan blight-resistant chestnuts, and helping the restoration of the great American chestnut. Or plant pecans, choosing varieties suited to your location. Wait up to ten years for nuts.

Walnuts (black and English, as well as hybrids like heartnuts butternuts, buartnuts) need a long-term plan. All walnut trees produce the compound juglone in all parts of the tree. This compound is allelopathic – it inhibits the growth of nearby plants, both edible and ornamental – so give them a space of their own. Hazelnuts grow more shrub-like if American, more of a small tree if European. Eastern filbert blight can be a problem with European hazelnuts, but not American ones.

The Korean Stone Pine or Chinese Pine Nut thrives on steep slopes and thin soils. The trees do grow tall, looking from a distance like American White Pines. Although self-fertile, they provide higher yields if two trees are planted. The cones take two years to mature, and are covered with a very sticky resin. Store them in bags until the scales separate. The seeds in their shells look like small pistachios.

Asian pears are easy to grow and the usual pear disease and pest problems (fire blight and codling moth) affect them less. Shipova is a hybrid of the European pear with the whitebeam mountain ash, propagated by grafts. The fruits are 1.5-2” (4-5 cm) and stay green for a long time before ripening to a blushing yellow. It can take ten years before any fruit is available. Usually the flavor is sweet, delicate and fragrant.

Quinces are tree fruits closely related to pears, and were more popular in the past. The Pilgrims brought quince seeds from northern Europe, and it was the only source of fruit pectin until the end of the nineteenth century. Watch out for fire blight and cedar apple rust. The fruit is hard and downy, and cannot be eaten raw. The easiest way to cook them is to bake them whole, when they become fragrant and delicious. The authors didn’t have this information, and instruct on peeling and de-seeding before cooking, which is slow work. Cooking whole and making jelly is another option. Older varieties of flowering quince also produce fruit, but in modern varieties that feature has been bred out and double-flowering has been bred in! A few of the fruiting varieties include Crimson and Gold, Jet Trail, Tanechka, and Toyo-Nishiki which all grow as shrubs, not trees.

Medlars are another ancient old world fruit, with not much modern-day interest. The fruits are not edible until “bletted” by a hard frost or by waiting beyond normal ripeness, when they get very close to rotting. The small trees have beautiful spring blossoms, and if you don’t harvest the fruit, they remain on the twigs during the winter, giving added interest then. They can also be eaten frozen during winter walks through the orchard.

American Persimmons really must ripen on the tree to be good eating. They don’t need a frost, but they do need to be soft, with a golden-orange to red-orange skin. Harvest the fallen ones each morning from late September until the end of November.

Beach plums grow wild on the east coast from North Carolina upwards, and while they are easy to grow, the quality of the small stony fruits varies. Nanking cherry is a short shrub producing small bright red (or white) cherries that can be used for pies. They fall from the bush when ripe, and need to be gathered and used soon, as they do not have a shelf life. The flowering shrub is very attractive.

There are some (relatively) hardy citrus, such as the trifoliate orange, a very thorny tree with small sour fruits, useful for marmalade and fruit sauces. The trees are very good for hedges and Flying Dragon makes a spectacular winter sight with snow on the twisted branches.

Jujubes are also known as Chinese dates or red dates. They are easy-care trees once established, ripening in mid-late fall if in full sun. If left to dry, the fruit gains a date-like texture. Two trees are required for cross-pollination, choosing varieties that have flowers opening at the same time of day. They can survive cold winters, provided the summer is long and hot.

Pawpaws have earned themselves several books of their own in recent years. Although tropical flavored, this fruit is adapted to temperate zones, and needs 400 chilling hours below freezing in order to flower. They are slow to reach fruiting age, but then are easy to maintain. The large oblong fruit contain several large seeds and a soft custard-like flesh. They can be eaten out of the skin with a spoon, or they can be frozen to eat later, like ice cream. Don’t eat the skins, and don’t eat cooked pawpaws. Two different trees are needed together for cross-pollination. There are myths about which insects pollinate pawpaws, but the authors attest to seeing many species of flies and beetles at work in their pawpaw flowers.

Black raspberries are a delicious wild fruit you can cultivate, although they are susceptible to disease and can spread the plagues to red and gold raspberries. Blackberries can be managed by thinning the canes, providing a trellis, shortening the canes or settling for a semi-wild, semi-constrained patch. Boysenberries are the result of complex crossing of blackberries, raspberries, and loganberries. The trailing canes are hard to manage, and the thin-skinned berries are best used very soon after harvest, without any need to travel.

Mulberries grow on trees, not canes, ripening in late June or early July. Everbearing types produce a second flush of fruit, into August. If you have large harvests of these delicious fruits, spread a tarp or sheet under the tree and shake the ripe fruit loose. There are black mulberries for southern areas, as well as the cold-hardy white and red mulberries. The Illinois Everbearing cultivar produces plentiful large fruit on a shorter tree than the wild types. The structure of the tree is a bit fragile, so you may need props under the branches.

Che berries look like dogwood fruit, but are not related. They are a kind of mulberry, and they are also related to figs. Their flavor is like both. They are now classified as a type of Osage orange. Aronia berries (chokeberry), Cornelian cherries, and goumi berries are all small berries that grow on shrubs or small trees that can make an attractive addition to a landscape. Goumi is an Eleagnus, related to the invasive autumn olive. Because goumi is not invasive (and the berries are bigger), it makes a good alternative. Also, goumi roots capture nitrogen from the air in the soil, improving its nutritional profile, and making it possible to grow them in salty soils.

Juneberries are also known as Saskatoon, Serviceberry, Shadblow and Shadbush. There are 20-25 species in North America, one for almost every climate area. Poor soil is sufficient, but full sun is better than partial shade. There is no sourness to the flavor, and the authors suggest that the mild flavor is enhanced if you chew the seeds too. They do make good pies, but because birds are fond of them, you may need to snack as they do, or harvest under-ripe.

Blackcurrants were once widely prohibited in the US, blamed for killing pine trees by spreading white pine blister rust. In most places it is no longer illegal to grow blackcurrants, and there are some disease-resistant blackcurrant varieties. They don’t do well in hot places, but the flavor is worth pursuing. The authors report that over a 14-year period, their pine trees have not been affected by the neighboring blackcurrants. Gooseberries are another European fruit once under the same ban as blackcurrants. Not all the European varieties do well in the humid mid-Atlantic, although there are still a hundred that do! Invicta, Poorman and Jahn’s Prairie are recommended as successful sweet types.

Blueberries.
Photo Marilyn Rayne Squier

Blueberries are native to North America, and do best in acid soils containing a specific beneficial mycorrhizal fungus around the roots to make soil nutrients absorbable. There are Northern Highbush, Southern Highbush, Rabbiteye and low bush types. See the book for recommended varieties. Huckleberries look like lowbush blueberries but have larger, crunchy seeds. Lingonberries, another blueberry relative, are Sweden’s national fruit and develop on low-growing spreading evergreen shrubs. They do best with acid soils, whether shady or sunny. In hot areas choose spots with afternoon shade. The plants make an attractive year-round ground cover, with the flowers and berries providing extra seasonal interest.

Seaberry (Sea buckthorn – but it’s not a buckthorn), produces shiny orange fruits in late summer, with high levels of several vitamins and many health benefits. The bushy plants have an aggressive growth pattern, and the thorns can be off-putting. But if you persist you can enjoy these tart berries cooked and sweetened.

Grapes are a well-known vine crop. Muscadines, the native American grapes, found in the Southeast and South central US, are not found in New York, and are therefore not in this book. Muscadines do better with high heat and humidity, being more resistant to fungal diseases. The fox grape, native in the northeastern US, lead to the development of the Concord variety. If growing grapes, cover each developing bunch soon after pollination with a paper bag stapled closed around the stem.

Arctic kiwis are related to the large fuzzy tropical ones, but are hardier, smaller – about 1” (2.5cm) long – and smooth. The large vines are easy to grow, but do need a strong trellis. Hardy kiwis or Chinese kiwis have vines that are much bigger – up to 100’ (30.5m) long, and can take years longer to start producing. Their fruits are a little bit bigger than Arctic kiwis, with a more complex flavor, and, again, no fuzz, so no need to peel. Unlike Arctic kiwis, they do not fall from the vine when ripe.

Here’s a rare one: Himalayan Chocolate Berry. This very ornamental member of the honeysuckle family naturalizes rapidly (invasive in warmer areas?). It feeds many birds, and provides small nibbles for passing humans. It will never be a commercial success, because the sporadic ripening reduces the size of any one harvest, and the berries tend to split once ripe. Honeyberry is another honeysuckle type that is edible (most honeysuckles are slightly poisonous.) Honeyberries are a very cold-hardy early-harvesting berry, a long-shaped, blue-purple fruit, ripe when no longer at all green inside. Aurora, Berry Blue and Borealis are recommended varieties. Birds love them.

Schisandra is another less-known vine, producing tangy red berries, hanging down in generous clusters. You will need to trellis this vigorous vine, and maybe search the foliage for the hidden fruit. Most people will want to sweeten the fruit or juice it with sweeter fruits. Schisandra is not invasive, and you will need to plant several to be sure of having at least one male and one female. Goji is a berry growing on a “vine disguised as a bush”.

Cranberries are well known, although not that many people construct a bog to grow their own. Instructions for creating a “bowl bog” are in this book. Elderberries are a relatively well-known fruit. Note that all green parts of the plant are toxic (I didn’t know). I am more familiar with European elderberries, which we happily eat raw, and juice. American elderberry is apparently slightly toxic, and to most tastes, not pleasant if eaten raw. This shrub is very tough and adaptable, and has many medicinal as well as culinary uses. York seems to be particularly sturdy. European varieties may grow for several years but then decline.

Spikenard is a native herbaceous perennial found in cool shaded woodlands, and growing to 5’ (1.5m) tall in a single season. The tiny berries are not poisonous as some sources claim, but if you are nervous, cook them. They look a little like elderberries.

Wintergreen is a distinctive flavor familiar from some American candy, toothpaste and chewing gum. The shade-loving vines hug the ground, thriving in acid soils. The scarlet berries ripen in fall, persist on the plants all winter, and actually become sweeter after some cold weather. They don’t taste good at the end of the winter, though, so harvest while they are good eating. There are some modern cultivars selected for larger berries, although this plant is mostly grown as a ground cover or used for winter wreaths. The leaves can be used as tea. Those allergic to aspirin should avoid wintergreen because all parts of the plant contain methyl salicylate, an aspirin-like compound.

Mayapples are found in the understorey of Eastern woodlands, pushing up through the leaf-litter in early spring and unfurling large palmate leaves. All parts of the plant except ripe fruits are poisonous, and too many fruits can have a laxative effect. The roots have been used to relieve indigestion, and cancer drugs are derived from them. The fruits are lemon-shaped, up to 2” (5cm) long. Wait for them to soften and start to wrinkle in the summer. Discard the skin and seeds (slightly toxic). The pulp of the ripe fruits has a tropical flavor.

Maypops grow on the very ornamental passionflower vine. The egg-size fruits don’t provide a lot of food, but have an interesting mildly sweet, mildly acid flavor, once the fruits start to wrinkle. The seed are surrounded by tasty edible arils (like pomegranates).

After all the profiles, there are two pages of further reading, two of plant nurseries, about 20 pages of extra notes about the crops, and 20 pages of index. A very well-researched book!

Author Allyson Levy
Author Scott Serrano

My favorite tomato varieties

Pink Boar tomato.
Photo Pam Dawling

Over the years I have developed definite preferences about some tomato varieties, and I also enjoy trialing a few new kinds each year. We do our experimenting in the hoophouse, where we can keep a closer eye on the plants, and keep the labels visible (few weeds!)

New this year have been Pink Boar, Geronimo, Cherry Bomb and Estiva. Two of those I want to grow again, and two can fade into history.

Pink Boar is a beautiful fruit, with olive green strips on a wine-red background, and dark red flash. The flavor is sweet, tangy, rich and juicy like Black Cherry and some of the other dark-fruited tomatoes. The plants are vigorous (some say “aggressive”) and productive, although I do notice a bit of a tendency to split. Not big messy splits like Black Prince, but manageable if you pay attention to harvesting them when ripe. It may be our “beginner problem” of not knowing their ripeness signs as well as the other varieties. I recently told one of our crew “close your eyes and press the bottom of the fruit.” If it’s at all soft, it’s ripe. I learned this years ago from a completely blind friend who grew a garden.

75-80 days to maturity, indeterminate OP, 2-4oz (56-112gm), 2-3 inches (5-7 cm) in diameter. They were bred by Brad Gates from Black Boar and Brown Boar, as part of their Wild Boar series. I hear they grow OK in Texas. You can buy the seed from High Mowing, Baker Creek, Peaceful Valley, and Wild Boar Farms, the breeder himself.

Cherry Bomb tomato.
Photo Johnny’s Selected Seeds

Cherry Bomb is a firm, bright red cherry tomato with a sweet, well-balanced flavor. The 64 day, F1 hybrid indeterminate plants produce good handfuls of ripe 15-20 gm fruits at each harvest. They are not prone to splitting (unlike Sun Gold).

Cherry Bomb has a high resistance to late blight. We have rarely suffered from late blight, but I like to grow a few resistant tomatoes just in case. And we have been looking for a tasty reliable red cherry. This might be it. Cherry Bomb is sold exclusively by Johnny’s Selected Seeds, who rate this variety for outdoors, not just hoophouses. It’s out of stock until August 2023, so it must be popular!

We love Sun Gold, Black Cherry and Five Star Grape, but have still been searching for another cherry. We weren’t wowed by Washington Cherry or Riesentraube (gave those up after one year). Initially, we were taken with Amy’s Apricot, but we lost patience with its variability. It’s tasty, and a nice one for those growing only a few plants, who like surprises. But we have enough confusion, and want more predictability.

Mountain Magic tomatoes in mid-July.
photo Pam Dawling

We appreciate Mountain Magic more each year! We have been growing Glacier and Stupice as early hoophouse tomatoes for years, but the green shoulders are off-putting. Glacier is a 56-day OP determinate with potato-leaf foliage and good flavor. Stupice is a 55-60 day OP with potato-leaf foliage, but is indeterminate. From suppliers’ photos you wouldn’t know these two varieties get green (or yellow) shoulders, and the descriptions often don’t mention that either. Some particular varieties are more prone to green shoulders and there is also a weather component. When these varieties are in sustained high temperatures (hoophouses!), lycopene (red color) production is reduced, and when direct sun beams on the tops of the tomatoes, temperatures inside the fruits rise. Perhaps we’ve been pruning them too much.

Hoophouse tomatoes with yellow shoulders. Glacier or Stupice.
Photo Pam Dawling

Another factor is that at high temperatures, chlorophyll can’t break down, and the red color is hidden. The yellow color is carotene, and it is more heat-resistant than lycopene. We’re ready to wait a few days longer, and have fruit that are red all round.

Mountain Magic is a 70-75 day indeterminate red 2 oz (56gm) hybrid, from breeder Randy Gardner in NC. It is productive, beautiful (no cracks!), trouble-free (resistant to both early blight and late blight, as well as Verticillium and Fusarium wilts) and, importantly, delicious. It looks a bit like Amy’s Sugar Gem, but is more regular, and has a better flavor. This year we increased the number of Mountain Magic and cut back on the Stupice and Glacier. Next year we will probably grow a higher proportion of Mountain Magic again. And stop pruning the Stupice and Glacier we do grow!

Not quite ripe yet! Jubilee tomato in late June.
Photo Pam Dawling

Jubilee (also known as Golden Jubilee) is a lovely medium-sized orange 80 day indeterminate OP we have grown every year for a long time. Beautiful, meaty, delicious sweet fruit. Disease-resistant and crack-resistant. The seed has been harder to find since the start of the Covid pandemic. One year we even bought somebody’s home grown seed that arrived labeled “Probably Jubilee”. It was close enough under the circumstances. Reimer, Eden Brothers, Willhite, Victory, Sandia, Hoss Tools and Bentley have it currently.

For more Tomato Appreciation, see Craig LeHoullier’s Tomato Collection Tour. I linked to part 6: numbers 51-70, because Craig mentions Valencia, a selection of Sunray, which was selected from Jubilee (a stabilized cross by Burpee between Marglobe and Tangerine). In my search for a good reliable tasty orange tomato I have at some time tried almost all of these, without knowing their family connections.

Craig says his “Grow Every Year” category includes Cherokee Purple, Cherokee Green, Cherokee Chocolate, Polish, Lucky Cross. Others, such as Brandywine, Dester, Ferris Wheel, Yellow Brandywine, Anna Russian are grown in his garden every other year.

Tropic tomato in mid-July. Photo Pam Dawling

Our workhorse red slicer is Tropic, a heat-tolerant, disease-resistant 80-day indeterminate OP from the University of Florida program. Good sweet flavor, 8-9 oz (225-250 gm) fruit. The Southern Exposure Seed Exchange selection is available from Wilcox. Other suppliers of Tropic include Urban Farmer and TomatoFest.

If you are searching for heat-tolerant varieties, as we might all be wise to do, to face climate change, peruse the TomatoFest site Tropical Hot/Humid Tomato Seed Colleciton.

Fruit for the Month: July

 

Pike muskmelon. Photo Southern Exposure Seed Exchange

This is another post in my new monthly series, about small fruits that can be grown sustainably in a mid-Atlantic climate. I cover planting, pruning, harvesting and care of the plants, according to the season. I’ll give links to useful publications. We have a focus fruit, and then more about others that need attention during the month. We do grow apples and pears, and some other tree fruit, but I’m not writing about those as I don’t have much recent experience.

Melons are the focus fruit for July

July is the month in our climate, to start harvesting muskmelons (often called cantaloupes), Asian melons, and canary melons. Next month I’ll talk about watermelons, which are slower to ripen.

Melons love warm, sunny days and need 80-100 days from seed sowing to harvest. For good production, melons warm weather, along with a steady supply of water. Melon plants also need good air circulation, so leaves and fruit can dry fairly quickly after dew or rainfall. To help prevent the spread of diseases, rotate crops and avoid growing them where other cucurbits were planted in the previous year or two.

Melons thrive in well-drained soil, sandy loam, or in clay soils that have been good levels of organic matter. Soil pH should be 6-6.5 for healthy melons and a good yields. Encourage drought-resilient crops by using drip irrigation, so that roots grow deep.

Mayor Canary melon in July. Photo Pam Dawling

Types of melons

Fastest to produce a crop are the 65-day Asian melons such as Torpedo (replaced Sun Jewel), or Early Silver Line. These 1-2lb (0.5-1kg) oblong melons have refreshing crisp white flesh and are mildly sweet. Some people disparage them as “cucumber melons,” but their good points are earliness, tolerance of chilly weather, being easy to grow and having a pleasant flavor.

Sun Jewel Asian melon. Photo Mary Kranz

Muskmelon (Cucumis melo reticulatus, commonly, but inaccurately called cantaloupe) is the melon type I have most experience with. They have a yellowish-buff skin with a raised netting, and sometimes lengthwise sutures (ribbing).  The flesh is orange with a complex sweet aromatic flavor, and the 3–7 lbs (1.5–3 kg) fruits take 75-84 days to mature. We have enjoyed Pike, Kansas, Delicious 51, Edisto 47 and Hales Best. My long-time favorite was Ambrosia from Seminis Seeds, but when Seminis was bought by Monsanto, I stopped growing it, as I don’t want to support Monsanto in producing GMOs. For Downy mildew resistance and tolerance to cucumber beetles, grow Trifecta from Southern Exposure Seed Exchange

Kansas muskmelon. Photo Southern Exposure Seed Exchange

True cantaloupes, Cucumis melo cantalupensis, are rarer in the US. They are rough and warty rather than netted. Prescott Fond Blanc and Petit Gris de Rennes are true cantaloupes, as are charentais melons. Charentais melons are smaller, round, good-flavored orange-fleshed melons. I have successfully grown 78-day Savor, a 2lb (0.9kg) melon with a green-grey skin and deep orange flesh.

Mayor canary melon. Photo Wren VIle

Canary melons are smooth yellow 4lb (1.8kg) fruits with white flesh and are quite sweet.75 days to maturity. We have had good success with Mayor.

Crenshaw melons are large oblong 78-day melons with light yellow skin and very aromatic pale creamy orange flesh.

Galia tropical melons have green flesh, yellow-tan skins and a round shape. Honeydew melons are fast-maturing, smooth skinned oval melons, usually with pale-green flesh, although Honey Orange is salmon-colored. 3lbs (1.4kg), 74 days.

We tried some smaller (individual serving) melons, Tasty Bites. personal-size melons (they top out at 3lbs/1.4kg) and Sugar Cube 2–2 1/2 lb (1kg). The advantage of having a smaller fruit was not more than the disadvantage of harvesting smaller fruits.

Sowing melon seeds

Melons are a bit finicky in their youth, but given a strong start, they can do very well. You can sow melon seeds directly in the garden, but the seeds need soil temperatures of 59°F (15°C) minimum to germinate, and their best temperature is 86°F (30°C). At that temperature they only take 3 days to emerge. More and earlier success comes with sowing melon seeds indoors, where the right temperatures can happen earlier in the year. Maximum germination temperature is 100°F (38°C).

Up to three weeks before your average last frost date, sow 2 or 3 melon seeds in potting compost at a depth of ½” (1cm) in 3” (7.6cm) pots or plug flats. We are in zone 7a, with an approximate last frost date of April 25 – we sow April 15 for May 6 transplanting (21 days after sowing). After germination, the temperature should be reduced to 75°F (24°C). We always ensure our melons get a spot in the greenhouse with very good light and no drafts.

Keep the soil moist and when seedlings have reached 2” (5cm) in height, snip off the weakest ones at soil level, leaving one strong seedling per pot or cell. When the first true leaves appear, lower the temperature to 65°F (18°C) and reduce watering a little.

Muskmelons flowering in early July. Photo Bridget Aleshire

Harden off the transplants for a week before you set them into the garden. Set them outside in a shady area on warm days, gradually increasing the time outside each day from one hour to two hours, to three, and so on. Alternatively, use shadecloth and increase the sun exposure by an hour a day. Reduce watering a bit, to slow plant growth. Check your local weather forecast to ensure that your melon plants will not be subjected to chilly, windy conditions when they are young.

Transplanting melons

Before starting transplanting, check the soil temperature: garden soil should be at least 70°F (21°C) for melon survival. Melon plants exposed to temperatures cooler than recommended might not set fruit later on. One way to speed up soil warming is to cover the area with black plastic mulch for 1-3 weeks prior. Cut an x-shaped slit where for each plant and hold the edges of the plastic down with rocks. We space our melons at 2’ (60cm) apart in the row, with rows 6’ (2m) apart.

Melons are admittedly delicate to transplant. When outdoor conditions, soil temperature, and timing are right for transplanting melons, take great care in handling the plants. To help reduce transplant shock, water the flat (or pots) well before transplanting and avoid disturbing the roots when transplanting into the garden. Plant the entire stem in the ground, leaving only the seed leaves upwards exposed. The stems are fragile, and will do better protected in the ground. Water the soil thoroughly. If you are not using black plastic, spread organic mulch (straw, spoiled hay or dry tree leaves) around the melon vines. You might rather hoe and wait until hot weather to spread organic mulch, as this will keep the soil cool, and as I stressed already, melons like heat. Depending on soil fertility, you may want to add fish emulsion to encourage growth.

If the weather is less warm than you hoped, use hoops and thick rowcover until you are more confidant in the temperatures, then switch to netting. We hoop and net our melons immediately after transplanting, to keep the bugs off. We keep the netting on until we see female flowers (they have miniature melons between the flower and the plant). Melons require pollination, so it is necessary to remove the netting.

A melon plant in July. Photo Southern Exposure Seed Exchange

Care of melon plants

If weeds emerge through the mulch, pull them slowly, while stepping next to the melon stem. Melon roots near the surface can easily be injured. As melons ripen, put a piece of cardboard under the fruit to help prevent rot. With the late summer planting, you can pinch off new flowers to steer the plant’s energy into fruit that has already set. Keep the soil around melons watered with 1-2” (2-5 cm) per week, up until the last week or two before harvest. Holding back on water during this time leads to sweeter melons.

Succession crops of melons

In our climate we can sow melons three times, a month apart. The first row is from transplants, set outside May 3-6. We direct sow the second bed on May 25, then June 25 and once, on July 15 for a “Last Chance” crop.

Pests and diseases of melons

Like most cucurbits, melons are vulnerable to striped cucumber beetles. These pests chew on plants and spread diseases, such as bacterial wilt and mosaic virus. Protect against cucumber beetles with rowcover or insect netting applied at transplanting, or hunt them every morning on leaves and inside flowers, when beetles are more slow-moving. Watch for aphids in the garden, as they can also spread viruses. You can usually hose off leaves or apply an insecticidal soap to kill aphids before they inflict too much damage. In warm, humid climates like ours, melons are subject to powdery mildew, which can wipe out a melon crop if not caught in time. Look for melon varieties that are disease resistant.

Sudden wilt is caused by cold weather in late summer when the plants are loaded with ripening melons.

Harvesting melons

I recommend harvesting daily, in the mornings, once the dew has dried, to avoid spreading fungal diseases.

With muskmelons, when the background-color of the skin beneath the “netting” changes from gray-green to buff or a yellowish color, the melon is almost ripe. A honeydew melon will turn a light yellow-white color when it’s ripe.

For some varieties (but not all), if gentle pressure is applied to the base of the stem, and the stem separates from the vine, the melon is ready. This is called the “full slip” stage. (The half-slip stage requires a bigger nudge.) Crenshaw and Canary melons require a good tug (“forced slip”). Honeydew, Charentais, and Piel de Sapo must be cut from the vine – don’t wait for them to slip!

Storage time for melon depends on the type. Relative humidity should be 85-95% for best results. Muskmelons will last a couple weeks at 40°F (4°C); honeydew can be stored up to three weeks at 50°F (10°C). Store other melons at 45-50°F (7-10°C) for 7-14 days.

Kansas Muskmelon.
Photo Southern Exposure Seed Exchange

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Other small fruits available in July

Floricane raspberry patch making new growth. Photo Kathryn Simmons

Blackberries, blueberries, crabapples, elderberries, gooseberries, goumi berries, mulberries, peaches, black and red raspberries.

https://harvesttotable.com/how-to-plant-grow-prune-and-harvest-blackberries/

https://harvesttotable.com/how-to-grow-elderberry/

If you live in Virginia, see https://www.vdacs.virginia.gov/pdf/producechart.pdf

Other fruit care in July

Water all fruit crops. Pack away blueberry netting after fruiting. Mow aisles, weed and water all fruit.

 Strawberries:

In late June/early July (after fruiting): Renovate one-year-old strawberry beds to carry over for another year, by mowing or shearing/clipping the plants, weeding and mulching, but don’t compost them at this stage. Dismantle two-year-old strawberry beds after gathering any propagation material.

If preparing to plant new plug-strawberries, till an area in late June or very early July and sow buckwheat by July 4. After three weeks, till in the buckwheat and prepare the beds.

If preparing to plant bare-root strawberries, (perhaps rooted runners in the paths of older beds), till the area by the beginning of July and prepare new beds with compost, driptape, and landscape fabric.

In early July, or at least by mid-July, plant new bare-root strawberry transplants.

A mister in an overhead pipe on a strawberry propagation bed. Photo Lori Katz

July 6-14: To propagate from your own plants, pot up pencil-thick crowns, with 2 or 3 leaves, 4” (10cm) petioles. Use Round-50 plug trays. Or use runner tips. Set up a shadecloth propagation tent in a cold frame, or other protected area Set up a misting system and timer. Also handwater once or twice a day, to keep the soil damp.

Strawberry beds in their second year. Photo Kathryn Simmons

Book Review: Manage Weeds On Your Farm

Front cover of Manage Weeds on your Farm

Book Review: Manage Weeds On Your Farm: A Guide to Ecological Strategies, by Charles Mohler, John Teasdale and Antonio DiTommaso. SARE Handbook 16, 2021, 416 pages, color photos, drawings, charts, $24.00

This immense book is a game-changer! A resource enabling us to understand weeds better and deal with them smartly, exploiting their weaknesses, making best use of natural and created resources.

About 300 pages comprise a directory of major agricultural weeds of the United States and Canada: about 20 grasses and sedges; about 45 types of broadleaf weeds. Many of the weeds in North America came from Europe, so the book’s usefulness is not restricted to this continent. The focus is on weeds of arable farmland. Gardens fit in this category, although the physical tools will be smaller! This part of the book is not merely to help you identify weeds, but to develop a management plan for each one.

The first part of the book is 120 pages of agricultural gold – an exploration of concepts of ecological weed management. Understanding the biology of weeds is vital to successful ecological management. (Note that I’m avoiding the use of the word control, as the authors do.) The book is “intended to provide the information you need to grow crops without synthetic herbicides, great expense or back-breaking work.” Good information is an efficient tool. Understanding more about how the biological world works will enrich your life!

This is not a book many of us will read cover to cover. It’s a toolbox. Read the first section, then seek out the profiles of your most problematic weeds and make a plan for each one. In each profile there is an identification section with good photos, a management section, a concise summary, referring back to cultural and mechanical strategies, and an ecology section with specific information leading to the recommendations in the management section.

Chapter 2, How to Think About Weeds, starts with the reminder that weeds die from various causes (any of which we can use to advantage). Seeds may fail to germinate, or get eaten. Seedlings die from drying out, disease, competition from other plants, or lack of light, or being eaten, mowed or turned under.

“The goal of ecological weed management is to arrive at a balance between birth and death that keeps the density of weed populations low most of the time and reduces them quickly when density starts to increase.”

You need to increase the death rate and reduce the germination rate of the weed seed bank, or else the population continues to increase. This demonstrates the value of understanding which tools to use in which situation. Keeping on hammering with a wrench will not work well!

Seed size is one of the characteristics of weeds that affect their successful management. Smaller seeds are easier to kill, because the seed does not provide much food for the seedling. Large-seeded crops and transplants can out-compete small-seeded weeds, if the timing of cultivation is right. There is a good explanation for why tillage prompts seed germination, which can give weeds the upper hand. Environmental cues such as soil temperature, the difference between night and day temperatures, oxygen levels, even a brief flash of light, can indicate if the seed is near the surface and whether there are competing plants up there. The cues can be very specific. Velvetleaf and tall morning-glory germinate in response to a sudden absence of certain volatile compounds which are vented from the soil during tillage. Understanding this Secret Life of Plants can help us figure strategies for specific weeds.

Different weeds germinate in different seasons, and crop rotation between spring, summer and fall crops will disrupt weed lifecycles and prevent any one taking over. Another consideration is that the same percentage of the seeds still in the soil will die each year. This means that if no fresh weed seed is added, the seed bank declines rapidly in the first few years, leaving some seed persisting for years.

The main cause of seed death is probably that seeds germinate in unfavorable conditions and then die. Secondly, seeds are eaten. Lastly, some seeds rot and decompose. Small seeds deep in the soil are unlikely to germinate. It takes a big seed to provide the resources to grow a shoot that can reach a long way to the surface. Galinsoga seeds rarely emerge from deeper than ¼” (6mm). Few seeds can germinate from deeper than 2” (5cm).

June-planted potato emerged through hay mulch. Potatoes are a C3 crop
Photo Pam Dawling

Nowadays we are learning about two photosynthetic pathways, C3 and C4. C3 plants thrive in cool, moist conditions, not needing full daylight to maximize their photosynthesis. Most cool-season grasses and broadleaf weeds use the C3 pathway.  They can increase photosynthesis (grow more) as CO2 concentration in the atmosphere increases. C3 crops like potatoes, pumpkins and soybeans will probably do better against C4 weeds as CO2 concentration increases in the climate disaster. C4 plants perform best at high temperatures, with more sunlight enabling more photosynthesis. Bermuda grass, foxtails, pigweeds, and common purslane use the C4 pathway. But C4 crops such as corn will have a harder time with C3 weeds. If your climate becomes warmer and drier, C4 weeds and crops will be favored over C3 weeds and crops. This effect may be stronger than the effect of increased CO2.

Silver Queen sweet corn with wilting pulled pigweed amaranth. Corn is a C4 crop, amarnath (pigweed) a C4 weed. Photo Kathryn Simmons

Other factors influencing growth include frost tolerance, drought tolerance, and the presence or absence of mycorrhizal fungi. The majority of flowering plants do form mycorrhizal associations, but many weeds and some crops do not. Brassicas, chenopods (spinach, beets, lambsquarters, amaranths), smartweeds and sedges do not. Mycorrhizae assist the growth of host plants by providing nutrients and a good growing environment. When conditions favor mycorrhizae, those crops are more competitive against non-mycorrhizal weeds.

The diameter of the roots also has a role. Large-seeded crops tend to have large diameter roots, while small plants tend to have small diameter roots, which can grow longer faster. Pigweed (small seeds) after 28 days of growth has a root-length:weight ratio eight times higher than sunflower (large seeds). Pigweed roots are better at gathering nutrients, because they explore more of the soil, and can absorb more nutrients (because the ratio of surface-area:volume is greater).

Some weeds flower near the end of their lifecycle, after growing quite large, in a “big bang” (pigweed and lambsquarters). Removing these weeds early in life prevents the competition from these large plants that reduce the crop yield. If you miss that opportunity, killing the weed later in life (before it seeds) will help future crops.  Other weeds are “dribblers” – they start to set seed while still small. They can hide among the crop plants, making seed whenever conditions are favorable. Failing to remove these weeds early in life will potentially reduce yields for many years. This is how galinsoga can be such a nuisance in vegetable farms, surviving where the soil is frequently cultivated, and sometimes neglected long enough for seeds to mature. It’s always worth hand-pulling a large galinsoga as you walk by, as the largest plants produce the most seeds.

Galinsoga – a fast growing, fast-seeding weed of cultivated soil.
Photo Wren Vile

All plant species have natural enemies (diseases and pests that have co-evolved to live in balance), plus the occasional alien plant enemy that could devastate the population. Consequently, there are few natural enemies of weeds other than imported ones. Bio-herbicides are rare. But there are less obvious natural enemies of weeds. The authors measured the mortality of lambsquarters and redroot pigweed in the absence of human intervention. 80% or more of the lambsquarters emerging after tillage died before maturity. Fungi and insects were the likely predators. Results with pigweed were similar.

There is a chart of edible weeds for those inclined to engage in direct weed eradication, and the chart includes cautions about toxic parts of each plant.

The chapter summary lists ten important lessons. Dealing with roots and rhizomes of perennial weeds; rotating between spring, summer and fall-planted crops; influencing when weed seeds germinate and when they die; using transplants; using slow release nutrients to feed your crops rather than the weeds; avoiding over-fertilization; preventing weeds from seeding; reducing arrival of new weeds on your farm.

Wheelhoe, Courtesy of Valley Oak

Chapter 3 is about cultural weed management. Ecological weed management involves “many little hammers”, using multiple strategies together in a complementary way. Crop rotation is one that involves advance planning. Spring weeds can be destroyed while preparing the soil for summer planting, reducing future pressures in spring crops. Good stands of overwintering cover crops, especially mixtures, can inhibit winter and spring weed germination. The diversity of field operations associated with particular crops is as important as the diversity of the crops themselves.

Growing healthy competitive crops is a fundamental part of weed management, and involves many aspects, starting with using high vigor, fast-germinating seeds. Planting the crop at an appropriately dense spacing will reduce weed opportunities. Any crop that produces multiple harvests (kale, tomatoes, squash) can be planted closer than most recommendations without loss of yield, whereas those with a single harvest (cabbage, lettuce, corn, root crops) will get smaller if planted too close. Planting 50% closer is usually worth trying, for a higher total yield, when smaller individual units are acceptable. Thus may involve more time harvesting, and bigger seed purchases. The reduction of weeds may benefit many subsequent crops.

Other factors not yet mentioned include row spacing, row orientation (plants get more light in rows that run N-S), choice of fast-growing or large-leaved varieties (Danvers are better at shading than Nantes type carrots), planting date (avoid the period when the dominant weed species is likely to grow vigorously), intercropping (practice with caution, avoid having two crops in competition), nutrient and water supply.

No-till cover crops, where the residue remains on the soil surface, will inhibit many weeds, and provide many other ecological benefits. Organic no-till isn’t the answer for every situation. It keeps soil cool and somewhat compacted, and doesn’t release its nutrients quickly, so it isn’t good for early spring crops, or early warmth-loving crops. To sow the necessary good stand of cover crops, tilling is required. This means no-till can have a valuable place in your rotation, but continuous organic no-till is not likely to work.

Tarping is a method of covering the soil with large opaque tarps for several weeks, to germinate and then kill emerging weeds by depriving them of light. This provides a seedbed ready to plant. Tarping can also be used to kill mowed cover crops or crop residues. Tarping can be useful in the transition from tilled to no-till farming, while weeds are still a big challenge.

Solarizing with clear plastic. Photo Pam Dawling

Solarization is another soil-covering practice, this time with clear plastic and the goal of heating the soil to kill weed seeds, pests and disease organisms in the top layer of soil. This method works in hot weather in areas with a good amount of sunlight. It works best when the plastic is laid tightly over well-prepared beds, providing good soil contact. The edges are buried to hold in the hot air. It takes several weeks to kill weed seeds, even when conditions are right.

A flock of chickens can do a good job of weed management, if penned in the vegetable garden early enough to allow 90 days after their removal before the crop is harvested (above ground crops) and 120 days for in-ground crops. These are commonsense food safety precautions required for Organic certification.

There are two main approaches to weed management. The first is to remove enough weeds so that crop yields are not compromised in an economically significant way. The second is to minimize weed seed production, aiming for very low weed populations, meaning little weed management work in the future. This preventive weed management requires more precise attention in the early years, including removing weeds that are not, in themselves, causing measurably lower yields. Either approach can be successful, but the preventive strategy is a good one for people who are growing older (!) and want less work in the future, while maintaining an income and satisfying work.

Chapter Four covers mechanical and other physical weed management methods. “The effect of tillage or cultivation on a weed population depends on the interaction between the nature of the soil disturbance and the ecological characteristics of the weed.” In other words, to control a particular weed, we need to know the features of that weed and choose methods of cultivation and tillage that will exploit the weaknesses of that weed, and take account of the weather, the soil conditions and the crop stage. Timing determines success, and the greatest success comes from using a planned sequence incorporating several operations.

There is a very clear explanation of vegetative reproduction of perennial weeds and how to thwart that process. Tilling chops up roots, which grow into new plants. Partial damage to perennial roots stimulates sprouting of dormant buds. The best chance of success comes from exhausting the root or rhizome pieces. With most perennial weeds, carbohydrates flow from the storage organ into the leaves until they produce enough food to return some to the root. The ideal stage to kill such plants is when the pieces of the storage organs drop to their minimum weight after growing new leaves. Generally this is after three or four leaves have grown.

Tilled fallow is a time without crops, when the plot is tilled often enough to stop weeds proliferating. Most annuals take 5 weeks to set seed, and so once every three weeks is a good tilling frequency, for management of both perennial and annual weeds. This will inevitably damage the soil structure. Growing a fast cover crop (buckwheat or a mustard) between tillages will reduce the damage.

Buckwheat cover crop in flower.
Photo Pam Dawling

A discussion of ten Principles of Mechanical Weeding follows. A useful chart of two dozen weeding implements and tools provides information on when and how they are best used, which crops they are most suited to and what their limitations are. The chart is followed by pages of clear drawings of various cultivators, with explanations of when they are most useful.

Often one goal is the creation of a surface layer of small aggregates allowing good air circulation and decreasing germination of new weeds. This is widely called a “dust mulch”. Weeding early, shallowly and often, is widely shared advice. Shallow soil disturbance can eliminate a large percentage of annual weeds, without bringing new seed to the surface. Small weeds do not re-root easily, as they have only small reserves of energy. Weeds over 2” (5cm) tall are more likely to re-root.

After the profiles of five farms with great weed management strategies, explaining their overall approach to weeds, comes the directory of weeds, including information on resources, naming, ecological information, recommendations for management and the limitations of those recommendations (for example, whether or not they have been field-tested).

There are summary tables of summer annual weeds, winter annual weeds, and perennial weeds, each subdivided into broadleaf weeds and grasses, with information on characteristics. To help with visualizing seed sizes from the weights given, they helpfully tell us that a lettuce seed is likely to weigh 1mg. The tables are followed by 3-4 page profiles for each weed, including several clear photos of the weed at different stages of growth, management suggestions, ecology and a handful of references for further reading.

There are tips on developing management plans for weed species that are not in the book. Some weeds are a big problem in a small geographical area, and of not much consequence elsewhere. Record your own observations, using the questions provided to focus your attention and identify the weed. Each taxonomic level (family, genus, species) can provide actionable information. There are some great resources for weed identification, leading me to find one from Virginia Tech https://weedid.cals.vt.edu/.

There is hope for dealing with even the worst weeds! “Competitive cover crops are effective for suppressing bermudagrass.” Example: A dense fall sowing of winter rye, barley or oats, harvested for forage in spring, with the stubble plowed under to allow sowing of a very competitive summer cover crop like cowpeas. The dense shade following the late spring soil disturbance will suppress the grass.

The directory is the main part of the book, and the part where you will want to search out your worst problems and form a plan. Keep this book in a place you can always find it when needed, for the rest of your farming life!

SARE logo

Time to sow fall broccoli and cabbage

Broccoli head after rain
Photo Wren Vile

We are almost at a big turning point of the growing season, the Summer Solstice, the longest day. We know that day-length influences plant growth, and that after the Solstice, some crops will gradually take longer and longer to reach maturity (others will bolt). Crops more influenced by temperature (like sweet corn) will continue to mature faster while the summer temperatures rise.

Here in central Virginia, most brassicas are planted in spring and again in fall. Unless your broccoli keeps going all summer, consider sowing a new crop for fall. Although it can be hard to think about sowing seeds in mid-summer, it’s very worthwhile to grow fall brassicas because as they mature in the cooler fall days they develop delicious flavor, while weeds and pests slow down. These crops need little care once established. The most challenging part is getting the seedlings growing well while the weather is hot. However, unlike some cool weather vegetables such as spinach and lettuce, brassica seeds actually germinate very well at high temperatures. The ideal is 77-85°F (25-29°C), but up to 95°F (35°C) works. Given enough water, summer seedlings will emerge in only 3 days. Once they have emerged, the challenge begins. As well as temperature and moisture in the right ranges, the seedlings need light (very plentiful in mid-summer!), nutrients, good airflow, and protection from bugs. We deal organically with flea beetles, Harlequin bugs, and sometimes cabbage worms. Our main defenses are farmscaping, and netting (and previously, rowcover).

My book Sustainable Market Farming, has a chapter devoted to Broccoli, Cabbage, Kale and Collards in Fall.

Fall broccoli patch.
Photo Kati Falger

Timing sowing of fall broccoli and cabbage

The number of days to harvest given in seed catalogs is usually that needed in spring – plants grow faster in warmer temperatures. To determine when to sow for fall plantings, start with your average first frost date (as an indicator of cooling temperatures), then subtract the number of days from seeding to transplant (21-28), the number of days from transplanting to harvest for that variety (given in the catalog description), the length of harvest period (we harvest broccoli for 35 days minimum), and another 14 days for the slowing rate of plant growth in fall compared to spring. For us, the average first frost is 10/14-10/20, and we sow 53-day broccoli 21+53+35+14 days before 10/14, which is 6/13-6/19.  The last date for sowing broccoli and cabbage is about 3 months before the first fall frost date. In our case that means July 14–20.

Planning and crop rotations for fall brassicas

Our rotation plan shows us a long way ahead how many row feet of fall broccoli and cabbage we can fit in. By the time we order our seeds in the New Year, we know roughly what we expect to grow. In February we draw up a spreadsheet of how much of what to sow when.

Because fall brassicas are transplanted in summer, it’s possible to grow another vegetable crop, or some good cover crops, earlier in the year. An over-wintered cover crop mix of winter rye and crimson clover or hairy vetch could be turned under at flowering, and be followed by a short-term warm weather cover such as buckwheat, soy or cowpeas. Brassicas are heavy nitrogen consumers. To minimize pests and diseases, don’t use brassica cover crops.

Systems for growing fall broccoli and cabbage transplants

The same systems you use for growing transplants in spring can also work well for fall. It can help to have your plants outside on benches, above the 3’ (1m) height of flea beetles. A shade-house might be ideal too. Direct sowing, in “stations” (groups of several seeds sown at the final crop spacing), works for small areas.

We use an outdoor nursery seedbed and bare root transplants, which suits us best. The nursery bed is near our daily work area, so we’ll pass by and water it. Having the seedlings directly in the soil “drought-proofs” them to some extent. They can form deep roots, and do not dry out so fast.

For the seedbeds we use ProtekNet on wire hoops. Choose the mesh size carefully. One with small holes is needed to keep flea beetles away – 25 gm or 47 gm. Overly thick rowcover can make the seedlings more likely to die of fungal diseases in hot weather – good airflow is vital.

Sowing fall broccoli and cabbage

Brassica seedlings growing outdoors under insect netting.
Photo Pam Dawling

 Our rough formula for all transplanted fall brassicas is to sow around a foot (30 cm) of seed row for every 12-15’ (3.6-4.6 m) of transplanted crop row. We aim for 3 seeds per inch (about 1 cm apart). This means sowing 36 seeds for 10 plants transplanted on 18” (46 cm) spacing. And we do that twice (72 seeds for 10 plants!), in two sowings a week apart, to ensure we have enough plants of the right size.

Fall Brassica Schedule

Our seedbeds have an 8-week program – see the spreadsheet above for examples of our timing, quantities and varieties. I like to have a regular afternoon every week to grow the transplants. If you’re growing for fewer than 100 people, you won’t need a whole afternoon! Each week after the first week, we also weed the previously sown plants, and thin to 1” (2.5 cm) apart. Then we check the germination, record it, and resow if needed to make up the numbers.

 

Bare root brassica transplants under Proteknet.
Photo by Bridget Aleshire

Transplanting fall broccoli and cabbage

We transplant most brassicas at 4 true leaves (3-4 weeks after sowing at this time of year). It is best to transplant crops at a younger age in hot weather than you would in spring, because larger plants can wilt from high transpiration losses. If we find ourselves transplanting older plants, we remove a couple of the older leaves to reduce these losses.

We transplant 6 days a week for an hour and a half or two hours in late afternoon or early evening, for 2-3 weeks. We water the soil in the plot an hour before starting to transplant. It is very important at this time of year to get adequate water to the plants undergoing the stress of being transplanted. Likewise, good transplanting technique is vital. Water a lot more than you do in spring. If you have drip irrigation, you can easily give a little water in the middle of each day too, which will help cool the roots.

One of our impact sprinkler tripods, in a broccoli patch.
Photo Pam Dawling

We transplant broccoli and cabbage in 34” (86 cm) or 36” (91 cm) rows, which is wider than necessary. Beds or paired rows can fit more plants in the same space, while still allowing room to walk. We hammer in stakes along the row, and attach ropes between them. These both mark the rows for transplanting, and support the netting that we use after transplanting to keep the bugs off. An 84” (2.1 m) width netting can form a square tunnel over two crop rows, giving good airflow. Wire hoops are an alternative. Watering the soil before planting, as well as afterwards, helps survival during the hot summer days.

Aftercare of fall brassicas

About a month after transplanting the broccoli and cabbage (late August-early September), we remove the netting, stakes, ropes and the sticks we use to hold down the netting edges, then hoe and till between the rows. Next we broadcast a mix of mammoth red clover, Ladino white clover and crimson clover. We use overhead sprinkler irrigation to get the clover germinated, and it also helps cool the brassicas. The ideal is to keep the soil surface damp for the few days it takes the clover to germinate. Usually watering every two days is enough. We may replace the netting if pest pressure seems bad.

 

Fall broccoli undersown with a mixed clover winter cover crop.
Photo Nina Gentle.

If all goes well, we keep the clover growing for the whole of the next year, mowing several times to control annual weeds. You could, instead, till in the clover in late spring or early summer to plant a food crop then.

Harvesting fall broccoli and cabbage

We harvest all our brassicas three times each week, and take the produce directly to our cooler.

Broccoli side shoots.
Photo Nina Gentle

Our main broccoli harvest period is 9/10-10/15, with smaller amounts being picked either side of those dates We like our broccoli heads to get as large as possible (without opening up) before we harvest. We test by pressing down on the head with our fingertips and spreading our fingers. We harvest as soon as the beads start to “spring” apart. This may be a little late for other growers. We also look at the individual beads and aim to harvest before the beads even think about opening. We cut the stem diagonally to reduce the chance of dew and rain puddling, which can cause rotting of the stem. Later we harvest the side shoots, until they are too small to bother with.

A storage cabbage, with curled-back leaf on the head, showing maturity.
Photo Bridget Aleshire

Cabbage heads up from 9/25 and holds in the field till late November. Cabbage is mature when the outer leaf on the head (not the outer plant leaves which are left in the field) is curling back on itself. For storage cabbage, we set the cut heads upside down on the stump, in the “basket” of outer leaves, and come back an hour later to gather them into net bags. This allows the cut stem to dry out and seal over, improving storability.

If you are already looking ahead to the fall, see my post Fall and Winter Vegetable Growing, Harvest and Storage, for lots of links to more info on season extension into cold weather; fall and winter vegetable harvests; and fall and winter vegetable storage. I will write more about other fall brassicas in the near future.

Big frosty fall cabbage.
photo Lori Katz