by Catherine Haug
Better Homes and Gardens Magazine, April 2010 issue included an interesting article titled “Planning and Planting.” The premiss of the article is to plant for the season: spring, summer and fall, to maximize the productivity of a small garden space (such as Square Foot Gardening). And, as described in The Winter Harvest Handbook by Eliot Coleman, and Paul Renner’s recent gathering on Peaceful Gardens Year-Round Food Production Facility, one can even plant through the winter if a greenhouse (or cold frame) is available.
The BH&G article illustrates the same bed, with plantings in each season. I expand upon this information, with what I’ve been learning over the last year or so. My sequence begins with Spring (NOW!) and goes through Winter.
Before the last frost date, as soon as soil is workable, it’s time to plant cool-season crops. For some of us in the Flathead – those who get lots of early spring sun – this will be in early March. Otherwise, this will be later in March.
What to pull:
Pull-up your overwintering crops (see Winter, below), and prepare your soil for the new season of planting.
What to retain:
If you planted garlic, lettuce and spinach the previous fall, they will start growing in earnest in spring.
If you saved your chard over the winter in a cold frame or greenhouse, you can transplant it to your garden in the spring.
What & when to plant:
Cool-season crops include lettuce, spinach, salad mixes, peas, chard, carrots, parsnips, radishes, turnips & rutabagas; also most greens such as kale, cabbage, broccoli, Asian greens, etc..
The following can be started indoors in later winter, for later transplant to the gardens:
- beets, broccoli, brussels sprouts, cabbage, cauliflower, chard, turnips, and lettuce.
Hardy to a hard freeze, so first to be planted as soon as the soil can be worked:
- when soil temperature is above 50F: pea, radish, spinach, brussels sprouts (as transplants), dry onions. Note: Peas like a climbing system, such as a teepee of poles, a ladder, or a wire/nylon fence.
- when soil temperature is above 65F: green onion
Semi-hardy to frost, so plant 2 weeks or so before last frost day (plant first two weeks in May, here), or prepare to cover when hard frost is predicted:
- when soil temperature is above 50F: beets, carrot, cauliflower (as transplants), lettuce, parsnips, potatoes; turnips can be planted 3-weeks before hard frost.
- when soil temperature is above 65F: chard
Consider creating natural garden hoops from Serviceberry or other native shrub branches to support your covers.
Summer, in gardening terms, means after the last frost date, which for us is between May 15 and May 31.
What to pull:
Several of your cool-season crops will start to bolt when the weather heats up and the hours of daylight maximize, typically in mid – late June. This is the time to pull up the bolted veggies and plant new crops that are very tender to frost (see below) in their place.
- Pull up spent lettuce, spinach that are ready to bolt
- Pull up radishes and turnips before they get woody.
If you planted garlic the previous fall (see below), you can harvest the scapes in the early summer (mid – late June), but leave the bulb and leaves until mid summer (mid-July or August). Then dig up the bulbs with the stems and dry for storage. See Harvesting & Growing Garlic for more detail.
[NOTE: if you intend to Save the Seeds from your heirloom cool weather crops, you will not be able to replant in their place until late summer/fall.]
What to retain:
Chard is one veggie that can remain in the garden through all three seasons. And you may also want to leave your cabbage and certain other greens that remain hardy through the hot season.
Many of your spring crops will just be beginning to grow good in late May, so leave them in place until you’ve harvested them in June or early July. This includes peas, beets, cabbage family, carrots, and onions.
Potatoes planted in spring won’t mature until August or early september
Pole beans and cucumbers can benefit from the climbing structure used by your peas in the spring, so leave those structures in place.
What & when to Plant:
In the place vacated by your spring crops, plant warm season crops that need warmer temperatures and long hours of daylight. Best time to plant is when soil temperature is above 65F.
Many summer veggies can be started indoors in April, so are ready for transplant after the last frost date. And it seems to me that those water blankets work well for tomatoes, to moderate temperatures in their immediate environment, until they are well-established out doors.
Tender to frost; plant about 1 week after last frost date (May 25 – June 8, here):
- Peppers (as transplants), beans, corn
Very tender to frost, so plant 2-3 weeks after last frost date (June 1 – 15, here):
- Cucumber, eggplant & tomato (as transplants), summer squash, pumpkin & winter squash, melons.
As summer wanes, nights become too cool for most heat-loving nightshades, and your beans will be mostly spent (unless you are saving the dried pods for dried beans or for future plantings).
Some cool weather crops such as turnips and rutabagas do better in fall than spring, because spring’s increasingly warming weather cuts short their growth and produces a less flavorful root. However, the greens are excellent in either season.
What to pull:
Remove most summer crops to make room for a second planting of cool-season crops.
Early September: pull peppers, eggplant, cucumbers and beans that will not thrive into the fall. If your tomatoes are still producing, you can leave them in place until after the first frost, typically in late September.
What to retain:
The chard should still be a viable crop through the fall, and even into early winter, if covered. Some tomatoes may continue to produce up until the first frost, typically late September.
Dry onions and brussels sprout, pumpkin and winter squash from spring and summer planting will not mature until fall.
Some cabbages from spring plantings can remain even after the first frost; some can even over-winter (see below, and check the seed packages for this).
What and when to Plant:
In late August, consider early starting of seeds in flats in a cool space for later transplant:
In the space vacated by the summer crops, short-season cool weather crops will do well planted in early September (for fall harvest):
- carrot, lettuce & salad mixes, green onions, parsnips, radishes, spinach and turnips.
- The BH&G article suggests also brussels sprouts & broccoli, but these may not mature before winter, so be prepared to cover them with plastic to mimic a cold frame.
Chard can also be planted, then moved to a cold frame or greenhouse to overwinter.
After the first frost (typically late September/early October, here) and you’ve removed your tomatoes, plant garlic, lettuce and spinach in their place; mulch well. The garlic will form good roots over the winter, then sprout in the spring. The lettuce and spinach may sprout in the fall, but will survive through the winter if mulched well, to produce your earliest spring crop. See Fall Planting of Veggies.
Not many veggies will produce during our cold winters, However, you can transplant your chard to a pot and it will continue to produce through the winter in a cold frame or greenhouse. Jeffrey F. had good luck with this, after he built his greenhouse (see Gathering Summary: Root Cellars, Gardens & Greenhouses, June 24, 2009)
Some cool-season crops can be left in the garden to over-winter, if mulched well. This includes cabbage and carrots. However, beware of burrowing animals such as voles and gophers, who may steal your over-wintering crops.
Also, as mentioned in the Fall section above, young garlic, lettuce and spinach crops can over-winter to produce early spring delights.
Cold Frames & Greenhouses
Cold frames came into use in Europe in the mid-late 1800s, to produce cool-season crops such as cabbage, broccoli, salad greens, lettuce and spinach through the winter. Since those early cold frames, the technique has been greatly refined; see gardeners.com for ideas.
SavvyGardener.com provides lots of good information on cold frames and hot houses, tunnels and row covers for winter crops.
See also The Winter Harvest Handbook, by Eliot Coleman or Cold Frames and Hot Bed. See Resources, below for more info on these resources.
Sequential Planting through the Seasons (pdf version of this post:)
From The EssentiaList:
- Garden Hoops from Natural Materials
- Harvesting & Growing Garlic
- Saving and Storing Seeds
- Fall Planting of Veggies
- Gathering Summary: Root Cellars, Gardens & Greenhouses (June 24, 2009)
- Potatoes: Planting, Growing and Harvesting
From other web sources:
- Square Foot Gardening (www.squarefootgardening.com)
- Kitchen Garden Planner (gardeners.com) for Square Foot Gardens.
- Cold Frames and Hot Beds (pdf) from SavvyGardener.com or Season Extenders (Virginia Cooperative Extension)
- Mother Earth News: Use Cold Frames to Grow More Food, Evolution of a Winter Harvest, A Garden for All Seasons, and Information & Advice on Home Garden Greenhouses
- When and How to Plant Potatoes (Mother Earth News)
- About Turnips & Rutabagas and Triumphant Turnips
From Books & Magazines:
- Better Homes and Gardens Magazine, April 2010 issue
- The Winter Harvest Handbook – Year-Round Vegetable Production using Deep-Organic Techniques and Unheated Greenhouses by Eliot Coleman, Chelsea Green Publishing, March 2009 (see Amazon.com for sneak-peak inside the book: www.amazon.com/Winter-Harvest-Handbook-Production-Greenhouses/dp/1603580816)
- The Montana Gardener’s Companion: An Insiders Guide to Gardening under the Big Sky, by Bob Gough and Cheryl Moore-Gough, Morris Book Publishing, LLC (used for information on frost hardiness in this post)