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Direct-Sow Seeds for “Cool-Season” Vegetables

Direct-Sow Seeds for “Cool-Season” Vegetables

When it comes to growing vegetables at home, you have two options for getting your garden started: you can start vegetables from seed (indoors or outdoors in the garden) or purchase small starter plants (called “transplants”) from a local garden center. Many gardeners use a mix of these techniques in their vegetable gardens each year.

Which method is best? It depends. Many vegetables prefer being directly seeded into the ground and do not thrive as well if they’re transplanted or disturbed. 

Of the vegetables that are planted as seed directly into the garden: Some are considered “cool-season” vegetables, which need a cool period to germinate, and others are “warm-season” vegetables, which need the soil to be warm enough to germinate and will not survive a frost. 

“Cool-season” vegetables have seeds which will germinate in cool soil. They are often planted in the spring (to mature before the weather gets hot) and in the summer (to mature in the cool of autumn). Below is a list of those veggies which prefer to be seeded directly into the soil (not transplanted):

Very hardy (can be planted 4 to 6 weeks before average last frost date)
  • Collards
  • Endive
  • Fava beans
  • Kale
  • Kohlrabi
  • Leeks
  • Lettuce
  • Onions
  • Peas
  • Rutabagas
  • Spinach
  • Turnips
Hardy (can be planted 2 to 3 weeks before average last frost date)
  • Beets
  • Carrots
  • Chard
  • Mustard
  • Parsnips
  • Radishes

Before Sowing Seeds

It goes without saying, you can’t just scatter seeds on the ground and expect all plants to grow!  Similar to a human, plants need the right environment, nourishment, and water. Here are some things to keep in mind before sowing seeds:

  1. Know Your Planting Dates. Before you even start planting, know when each vegetable should be planted.
  2. Have a Plan. Know where each vegetable will go. For example, consider which vegetables need shade and which vegetables are tall so they do not shade shorter plants. Also, plant so that you can reach the center of the row or bed easily enough to weed, water, and harvest. Remember, you can plant cool-season crops in the same place as warm-season crops later in the season, based on the vegetable’s days to maturity (on the seed packet). 
  3. Prepare the Soil. Your seeds need rich, fertile soil to grow. Add organic matter in the spring and work it into the soil, digging down about 1 foot to loosen the soil. Alternatively, do as many gardeners do and add organic matter in the fall so that it needs little work in the spring. 
  4. Remove Weeds. Before you plant any seeds, the area MUST be weed-free! Otherwise, the weeds are competition for water and nutrients.
  5. Apply Fertilizer. In the spring—shortly before planting—work fertilizer into the soil. A soil test will help determine soil deficiences. 
  6. Use Quality Seed. Seeds do have a shelf life, and while you can often get away with using older seeds, just be prepared for lower germination rates. Use fresh seed from a reputable company for the best results
  7. Protect Seedlings From Frost. If you plant in early spring, be prepared to insulate young seedlings from cold weather—from cloches to row covers.

How to Plant Seeds

Sowing seeds is pretty simple, but there are some tips and tricks to make it easier, including the following:

  1. Sow at the proper depth. In general, plant seeds at a depth two times the seed’s diameter, no deeper. However, do refer to the seed packet for this information. Some seeds only need to be pressed into the soil surface, as they need more light to germinate. For seeds at two or three times the depth, poke individual holes for seeds or create a furrow. You can use a pencil to poke holes if you wish!
  2. Pay attention to seed spacing. You can plant lettuce, radishes, carrots, and other small seeds densely, and then thin them to the correct spacing when the seedlings are small. In general plan to sow some extra seeds, since not all seeds may germinate.
  3. Plant in defined rows if you are a beginner; don’t scatter widely. It’s easier to keep weeds down between rows and identfy seedlings from weedlings. (Weeds don’t usually grow in rows!) Often, rows are spaced about a foot apart, but refer to your seed packet for specifics.
  4. Firm the soil, once seeds are sown. This ensures good contact between seed and soil.
  5. Water new seeds gently! Don’t turn the hose on full strength and blast them or you’ll wash those seeds away or cause them to drift together. Use a fine, gentle mist to moisten the soil or let the water hose slowly trickle around the area.
  6. Prevent soil crusting. Weak seedlings (such as carrots) can struggle to break thrugh the soil surface if a hard crust forms. After covering seeds with soil, add a thin layer of fine mulch or compost to help prevent crusting. When you plant, you can also mix in seeds that germinate quickly (such as radishes), which will break through the crust and allow weaker seedings to grow.
  7. Mark the spot where you planted your row of vegetables; it’s very easily to forget, especially when you are trying to differentiate between seedlings and weeds! Use a popsicle stick to label rows, or anything that works for you!

Caring for Seeds and Seedlings

Once seeds are sown, be sure to keep them cared for!

  1. Keep soil moist until the seed germinates. Watering seeds is critical. Never let the soil get dry; seedlings do not have a good root system and will dry out within hours, especially if it’s windy outside. Use drip irrigation or put the hose at ground level and let the water gently soak the planting area.
  2. You’ll need to thin seedlings to the right spacing when they are a couple of inches high. Don’t be scared to thin! If you don’t, your plants won’t have space and nutrients to grow and will crowd together.
  3. Protect seedlings. Some pests do love those tender seedlings, too. If you have critters or pests, there are a number of different techniques to protect your seedlings, including netting, row covers, and little plant collars.
  4. Continue to pamper your seedlings until they become established plants!

By the Editors at Old Farmer’s Almanac

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