May is a busy seed-sowing month in Canada. Direct sow cool crops like lettuce, spinach, radish, carrots, beets, peas, kale, and chard early in the month. After frost risk has passed, sow beans, cucumbers, zucchini, squash, corn, pumpkins, basil, sunflowers, zinnias, cosmos, marigolds, and nasturtiums. Start melons and peppers indoors or transplant strong seedlings for the best results.
Warm Season Crops to Sow
Beans
Cucumbers
Zucchini
Summer squash
Pumpkins
Sweet corn
Okra, in warmer regions
Melons, best in warm areas or started indoors first
Cool Season Crops To Sow In May
Lettuce
Spinach
Kale
Swiss chard
Arugula
Radish
Carrots
Beets
Turnips
Peas
Green onions
Kohlrabi
Bok choy
Flower Seeds to Sow In May
Sunflowers
Marigolds
Zinnias
Cosmos
Nasturtiums
Calendula
Bachelor’s buttons
Sweet alyssum
California poppies
Coreopsis
Morning glory, after frost
Four o’clocks, after frost
Pepper Seeds to Sow In May
Jalapeño
Fresno
Banana pepper
Hungarian hot wax
Cayenne
Shishito
Mini bell peppers
Sweet bell peppers
Habanero, grown in containers indoors.
Scotch Bonnet, best as a transplant
Carolina Reaper and superhots, best started indoors
Herb Seeds to Sow In May
Dill
Cilantro
Parsley
Chives
Summer savory
Borage
Chervil
Fennel
Basil, only after frost
Herb Seeds Sow Indoors, Transplant Later
Start indoors or transplant later:
Rosemary
Thyme
Oregano
Sage
Lavender
Mint
Lemon balm
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