Spring Planting Guide: Best Seeds to Start in May

May is one of the most exciting months in the garden. Frost risk is fading, soil is warming up, and it's prime time to get seeds in the ground. Whether you're a first-time grower or a seasoned gardener, here's your go-to guide for what to plant this May.

Why May Is a Prime Planting Month

For most of the US (zones 5–10), May marks the safe window after the last frost date. Soil temperatures are consistently above 60°F, days are getting longer, and warm-season crops are ready to thrive. For Caribbean and tropical varieties, May is especially ideal — these plants love heat and will take off fast.

Best Seeds to Direct Sow in May

Vegetables

• Peppers — Transplant seedlings started indoors in February/March. If you're in zones 9–11, you can still direct sow now.
• Cucumbers — Fast-growing; direct sow after last frost. Ready in 50–70 days.
• Squash & Zucchini — Plant directly in the ground; they grow quickly and produce abundantly.
• Beans — Bush and pole beans love warm soil. Sow every 2 weeks for continuous harvest.
• Okra — A Caribbean garden staple; thrives in heat and humidity.
• Callaloo (Amaranth) — Direct sow in warm soil; grows fast and is ready to harvest in 30–40 days.

Herbs

• Basil & Thai Basil — Wait until soil is consistently warm; basil hates cold.
• Cilantro — Sow now for a late spring harvest before summer heat causes bolting.
• Chives & Garlic Chives — Hardy and easy; direct sow or transplant.

Flowers

• Marigolds — Natural pest deterrents; plant near peppers and tomatoes.
• Nasturtiums — Edible flowers that thrive in poor soil with minimal care.
• Sunflowers — Direct sow in full sun; they'll be blooming by July.
• Cosmos — Low-maintenance, pollinator-friendly, and beautiful all summer.

Seeds to Start Indoors in May (for Fall Harvest)

• Kale & Collard Greens — Start indoors in late May for a fall crop.
• Broccoli & Cabbage — Start 10–12 weeks before your first fall frost.
• Leeks — Long growing season; start now for fall harvest.

May Planting Tips

• Check your last frost date before direct sowing warm-season crops — use the USDA Plant Hardiness Zone Map.
• Harden off transplants over 7–10 days before moving them outdoors permanently.
• Water consistently — May can be dry in many regions; young seedlings need even moisture.
• Mulch early to retain soil moisture and suppress weeds as temperatures rise.
• Label everything — it's easy to forget what's planted where once things start growing!

Caribbean & Tropical Varieties to Prioritize This Month

May is the perfect time to get your Caribbean favorites in the ground:

• Scotch Bonnet & Habanero peppers
• Jamaican Callaloo
• Pigeon Peas (Gungo)
• Bitter Melon
• Winged Beans
• Papaya (in zones 9–11)

Many of these are available as seed packets starting under $2 — making May the most affordable time to diversify your garden.

Final Thought

May is your green light. The soil is ready, the sun is strong, and the growing season is wide open. Stock up on seeds now and make the most of every warm week ahead.