What You Can Direct Sow in The Month of May

By TigreBlume

There is a unique satisfaction in skipping the seed trays and sowing directly into the garden beds. Not only does it save precious indoor space, but many of our favorite vegetables and flowers actually prefer the lack of root disturbance. As soil temperatures climb across the country, the window for direct sowing opens wide for everything from heat-loving beans to pollinator-friendly herbs. To help you maximize your growing season without the guesswork, I’ve rounded up the best varieties to sow in May, tailored specifically to your local climate and zone.

Here is a breakdown of common vegetables, herbs and flowers you can direct sow in May by USDA zone…

Zones 3–6 (Cool Climate Zones)

  • Vegetables:

    • Leafy Greens: Spinach, Lettuce, Kale, Collard Greens, Mustard Greens, Arugula, Swiss Chard, Asian Greens (Pak Choi, Bok Choy, etc.), and Cabbage.

    • Root Veggies: Carrots, Radishes, Beets, Parsnips and Turnips.

    • Alliums: Onion sets and Leeks.

    • Legumes: Peas/Beans (bush, snow and snap), Lima Beans.

    • Others: Cucumbers, Summer Squash (zucchini), Winter Squash, Pumpkins, Watermelon, Kohlrabi and Green Onions (bunching onions).

  • Herbs: Cilantro, Parsley, Basil, Dill, Fennel, Chives/Garlic Chives, Fennel, Mint, Lemon Balm, Catnip, Sage, and Lavender.

  • Flowers: Hardy annuals and perennials like Sunflowers, Zinnia, Cosmos, Nasturtiums, Marigolds, Calendula, Bachelor’s Button, Snapdragons, Borage, Nigella, Larkspur, Celosia, Gomphrena, Amaranth, and Black-eyed Susan.

Zones 7–8 (The Mild Winter Zones)

  • Vegetables:

    • Leafy Greens (heat-loving varieties): New Zealand Spinach and Summer Crisp Lettuce

    • Root Veggies: Sweet Potatoes (slips).

    • Legumes: Beans (bush, pole, snap, and lima beans), Southern Peas.

    • Others: Okra, Cucumbers, Summer Squash, Zucchini, and Winter Squash (like butternut and acorn), Melons and Sweet Corn.

  • Herbs: Basil, Oregano, Lemon Balm, Marjoram, Catnip, Borage, Cilantro, Dill, Parsley and Summer Savory. Note: As May progresses, providing some afternoon shade for cilantro and dill will prevent them from bolting (going to seed) immediately.

  • Flowers: Hardy annuals and perennials like Zinnias, Sunflowers, Cosmos, Calendula, Bachelor’s Buttons, Nasturtiums, Amaranth, Borage, Marigolds, and Alyssum.

Zones 9–11 (The Warm South)

In March, gardeners in zones 9-11 can directly sow both cool-season crops and early warm-season vegetables.

  • Vegetables

    • Legumes: Beans (snap, pole, lima) and Southern Peas (cowpeas).

    • Others: Okra, Melons, Cucumbers, Zucchini, Winter Squash/Pumpkins and Corn.

    • Potatoes: Sweet Potatoes (slips).

  • Herbs: Marjoram, Dill, Fennel, Basil, Borage, Oregano, Thyme, Mint, Rosemary, Sage, and Lemon Balm.

  • Flowers: Hardy annuals and perennials like Sunflowers, Zinnias, Marigolds, Cosmos, Nasturtiums, Celosia, Amaranth, and Blanket Flower.

For direct sowing—planting seeds directly into their permanent outdoor home—success depends on matching the seed to the soil temperature and managing early-spring moisture. Here are a few quick tips:

Tip #1 - Check Your Soil Temperature - While the air might feel warm, the soil often lags behind. Sowing seeds into cold, wet mud can cause them to rot before they germinate.

  • Cool-season crops (peas, radishes, spinach, and lettuce) generally need a soil temperature of at least 45°F to 50°F.

  • Wait on the "heats": Avoid direct sowing "summer" crops like beans, corn, or cucumbers until the soil consistently hits 60°F+.

Tip #2 - Prepare the Seedbed - Spring soil can be compacted from winter snow or rain.

  • Avoid tilling wet soil: If you squeeze a handful of soil and it forms a solid, sticky ball, it’s too wet to work. Wait until it crumbles.

  • Lightly rake: Use a garden rake to create a fine "tilth" (a smooth, crumbly surface). This ensures good seed-to-soil contact, which is vital for moisture absorption.

Tip #3 - Monitor Sowing Depth - A general rule of thumb is to plant a seed at a depth of two to three times its width.

  • Tiny seeds (like lettuce or carrots) need very little cover—sometimes just a light dusting of soil—because they may require some light to germinate.

  • Larger seeds (like peas or nasturtiums) can be planted deeper where the moisture levels are more consistent.

Tip #4 - Manage Early Spring Pests - April is prime time for slugs, snails, and birds looking for an easy snack.

  • Protective covers: Use lightweight row covers or "cloches" (milk jugs with the bottoms cut out also work well) to protect tender seedlings from overnight frosts and hungry critters.

  • Thinning: If you sow heavily to ensure a good stand, be sure to thin the seedlings once they have their first "true" leaves so they don't compete for nutrients.

Always check your local "Last Frost Date" before sowing. If your soil is still workable but a deep freeze is predicted, a simple layer of mulch or a row cover can give your seeds the extra protection they need to thrive.