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When do you plant a fall vegetable garden?

This weekend is too hot to plant -- but not to plan

Sacramento Digs Gardening
BY Debbie Arrington PUBLISHED SEP 1, 2022

Check your seeds and decide where and when the new plants will go in. Kathy Morrison

When do you plant a fall vegetable garden? It depends.

In Sacramento, Labor Day weekend traditionally marks that crossover from summer harvest to fall planting – but only after the tomatoes stop producing.

This summer, most of our tomatoes are already spent, victims of a very dry, very hot 2022. Those conditions put extra stress on plants. Heat-loving spider mites moved in and made themselves at home, sapping vines of energy.

For many tomato growers, the 2022 harvest was below par or nonexistent. Due to so many triple-digit days (35 and counting), tomato pollen dried up before it could fertilize flowers.

So, yeah, now is probably a good time to turn the page and pull the vines.

But when do you plant the fall veggies? Not quite yet, but soon. So, it's time to plan if not to plant.

With forecasts of record-high temperatures for this weekend, conditions are not good for setting out baby transplants; they’ll immediately be stressed. But as soon as the weather cools back to normal – mere 90s, not 100s – the fall seedlings can go in the ground. That could be next week.

Why plant cool-season crops when it’s still hot? Warm soil promotes rapid root development – a big plus for a good harvest in November, December and January.

Many cool-weather favorites – such as cabbages, head lettuce, broccoli and Brussels sprouts – take months to develop to maturity. Cabbage, for example, takes 60 to 100 days to form a solid head. Plant in September for Christmas cabbage.

Just not this weekend.

When it is cool enough to venture outside, prepare garden beds before transplanting. All those summer veggies sucked up a lot of nutrients. Cultivate and add compost to the soil. Let it rest a week or more before planting.

What to plant? In September, plant onions, lettuce, peas, radishes, turnips, beets, carrots, bok choy, spinach and potatoes directly into the vegetable beds.

Transplant cabbage, broccoli, kale, Brussels sprouts and cauliflower as well as lettuce seedlings. It’s not too late to start those seeds indoors and transplant in October or early November.

It’s a great time for flower planting, too. Sow seeds of California poppies, clarkia and African daisies. Also, transplant cool-weather annuals such as pansies, violas, fairy primroses, calendulas, stocks and snapdragons.

Whatever you plant, remember to water regularly. Seeds need even moisture to sprout. Avoid stressing new transplants by making sure soil doesn’t dry out.

And just like in summer, mulch works wonders, retaining soil moisture while cutting down on weeds. A new layer of mulch will help get those new seedlings off to a great start.

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Sacramento gardening fall triple-digit temperatures transplants heat wave planting cool-weather vegetables brassicas

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Garden checklist for week of Aug. 2

Get out early in the morning and monitor your garden’s moisture needs. Deep water and add temporary shade structures for plants that are feeling a little burned. In particular, protect developing peppers and eggplant.

* Put off fertilization until this heat passes; plants need to concentrate on hydration instead of growth.

* Harvest tomatoes, beans, squash, pepper and eggplants to prompt plants to keep producing. Give your plants a deep watering twice a week, more if planted in containers.

* Watch out for caterpillars and hornworms in the vegetable garden. They can strip a plant bare in one day. Pick them off plants by hand in early morning or late afternoon.

* Mulch can be your garden’s best friend – it conserves moisture while blocking out weeds. But don’t let mulch mound around stalks, stems or trunks. That can promote rot.

* Pinch off dead flowers from perennials and annuals to lengthen their summer bloom.

* Pick up after your fruit trees. Clean up debris and dropped fruit; this cuts down on insects and prevents the spread of brown rot.

* Prepare for a fall full of flowers by paying a little extra attention to your garden. Cut off spent blooms from roses, annuals and perennials. Roses will rebloom about six to eight weeks after deadheading.

* Indoors, start seedlings for fall vegetable planting, including bunching onion, cabbage, broccoli, cauliflower, kale, radicchio and lettuce.

* Sow seeds of perennials in pots for fall planting including yarrow, coneflower and salvia.

* In the garden, direct seed beets, carrots, leaf lettuce and turnips. Make sure to keep seeds and seedlings consistently moist.

* Plant potatoes.

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