May is the main planting kickoff in cold-winter zones, when gardens finally move from starts and prep into full outdoor action. Early May often still favors hardy transplants and direct-sown cool-season crops, while mid-to-late May is when many areas can safely set out warm-season plants as frost risk drops. Keep hardening off seedlings, use row cover if nights run cold, and focus on steady watering and early weed control so young plants establish quickly.
Indoors (fresh harvests):
-
Microgreens: peas, broccoli, sunflowers, arugula
-
Sprouts: alfalfa, broccoli, radish, mung
-
Herbs & greens under lights: chives, parsley, mint
Crops to start indoors in good light: tomato, pepper, eggplant, basil, cucumber, squash, melons, zinnia, marigold
Transplants to move outdoors (harden first): broccoli, cabbage, cauliflower, kohlrabi, lettuce, onion, parsley, pansies, snapdragons — and by mid-to-late May, tomato, pepper, and eggplant as frost risk drops
Crops that can be directly sown outdoors in May: peas, spinach, kale, Swiss chard, beets, carrots, radishes, turnips, parsnip, dill, cilantro — and after last frost: beans, corn, cucumber, squash, sunflower, nasturtium, sweet peas
Cover crops: oats, field peas, hairy vetch, red clover
Tip: This zone group covers a lot of territory. Nothing replaces talking with experienced gardeners in your area and watching the weather closely.
Use your USDA zone as a guide. Microclimates matter — coastal/urban spots run warmer; high elevation runs colder.
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Peppermint Seeds
90 Days. Peppermint Culinary Herb Seeds. Mentha sp. Non-GMO. A deliciously versatile and bright herb, peppermint seeds are a naturally occurring hybrid between culinary spearmint and watermint. Grown very similar...
Onion Seeds - Bunching - Tokyo Long White
60-90 Days to maturity. Allium fistulosum. Tokyo Long White Onion Seeds. Non-GMO, perennial, open-pollinated, heirloom, cold tolerant, drought tolerant, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds,...
Lemongrass Seeds - West Indian
90-100 days. West Indian Lemongrass Culinary Herb Seeds. Cymbopogon citratus. Non-GMO. Heirloom. West Indian lemongrass seeds grow the edible, tender, and delicious cultivar of lemongrass. Not to be confused with...
Onion Seeds - Bunching - Evergreen White Nebuka (Organic)
65-120 Days to maturity. Allium fistulosum. Organic Evergreen White Nebuka Onion Seeds. Non-GMO, perennial, organic, open-pollinated, heirloom, cold tolerant, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds,...
Lemon Balm Seeds
Melissa officinalis Perennial. Non-GMO, Heirloom Lemon Balm Herb Garden Seed from True Leaf Market. Melissa officinalis. Lemon Balm resides in the mint family and is native to regions in West...
Spearmint Seeds
50-70 Days to maturity. Mentha spicata. Spearmint Seeds. Non-GMO, perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Enjoy the vibrant, fruity aroma of...
Moringa Seeds
160-170 Days to maturity. Moringa oleifera. Moringa Seeds. Non-GMO, Perennial, Deciduous Softwood Tree. Moringa is also known as the Drumstick Tree, Horseradish Tree, and Ben Oil Tree. It is enjoyed...
Peppermint Seeds (Organic)
Perennial herb garden seeds. Certified Organic by Oregon Tilth. Non-GMO, Heirloom Peppermint Herb Garden Seed from True Leaf Market. Mentha sp. Peppermint plants are cool perennial and hybrid mints native...
Cress Seeds - Watercress
Non-GMO, Heirloom Watercress Herb Garden Seed from True Leaf Market. Nasturtium officinale. Watercress, also known as "Yellowcress" is a hardy perennial native to regions in Asia and Europe. This trailing...
Lemon Mint Seeds
Monarda citriodora Annual. Non-GMO, Heirloom Lemon Mint Herb Garden Seed from True Leaf Market. Monarda citriodora. Lemon Mint resides in the mint family as a warm perennial. Lemon Mint develops...
Onion Seeds - Bunching - Evergreen White Nebuka
65-120 Days to maturity. Allium fistulosum. Evergreen White Nebuka Onion Seeds. Non-GMO, perennial, open-pollinated, heirloom, cold tolerant, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers....
Marshmallow Herb Seeds
60-90 Days to maturity. Althaea officinalis. Marshmallow Herb Seeds. Non-GMO, perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, and raised beds. A beautiful pollinator and traditional medicinal...
Onion Seeds - Bunching - Warrior AAS
60 Days to maturity. Allium fistulosum. Warrior Bunching Onion Seeds. Non-GMO, perennial, open-pollinated, AAS Regional winner (Southeast, Mountain/Southwest), bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and...
Onion Seeds - Bunching - Kyoto Kujo Negi
80 Days to maturity. Allium fistulosum. Kyoto Kujo Negi Japanese Bunching Onion Seeds. Non-GMO, perennial, open-pollinated, heirloom, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers....
Onion Seeds - Bunching - Red Beard
40-50 Days to maturity. Allium fistulosum. Red Beard Japanese Bunching Onion Seeds. Non-GMO, annual, perennial, open-pollinated, heirloom, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers....
Parsley Seeds - Japanese Mitsuba
50-60 Days to maturity. Cryptotaenia japonica. Japanese Mitsuba Parsley Seeds. Non-GMO, annual/perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, and raised beds. The long stalks of this...
Japanese Mugwort - Yomogi
45 Days to maturity. Artemisia princeps. Yomogi Japanese Mugwort Seeds. Non-GMO perennial heirloom. Yomogi, or Japanese Mugwort, is an easy-to-grow perennial herb that grows in almost any condition. It is...
Onion Seeds - Bunching - Ishikura Winter Long
40-60 Days to maturity. Allium fistulosum. Ishikura Winter Long Japanese Bunching Onion Seeds. Non-GMO, annual, perennial, open-pollinated, heirloom, cold hardy, bunching onions. Suitable for growing in greenhouses, garden plots, raised...
Catmint Seeds - Blue Moon
60-80 Days to maturity. Nepeta nervosa. Blue Moon Cat Mint Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, perennial. This heat-tolerant flowering herb is just the versatile plant that your garden needs!...
Onion Seeds - Bunching - White Ishikura (Organic)
60-66 Days to maturity. Allium fistulosum. Organic Bunching White Ishikura Onion Seeds. Non-GMO, annual, perennial, organic, open-pollinated, heirloom, cold hardy, bunching onion. Suitable for growing in greenhouses, garden plots, raised...
Mint Seeds - Pennyroyal
90 Days to maturity. Mentha pulegium. Pennyroyal Mint Seeds. Non-GMO, annual or perennial, open-pollinated, heirloom. Suitable for growing in containers, garden plots, raised beds, and greenhouses. Pennyroyal Mint is a...
Fennel Seeds - Sweet
90-115 days. Foeniculum vulgare var. azuricum. Sweet Fennel Seeds. Non-GMO, annual, heirloom, open-pollinated. This early strain is suitable for garden plots, raised beds, and containers. Sweet Fennel is a cool-bulbing...
Onion Seeds - Bunching - Tokyo Long White (Organic)
60-90 Days to maturity. Allium fistulosum. Organic Tokyo Long White Onion Seeds. Non-GMO, perennial, organic, open-pollinated, heirloom, cold tolerant, drought tolerant, bunching onion. Suitable for growing in greenhouses, garden plots,...
Onion Seeds - Bunching - Shimonita Negi
120-140 Days to maturity. Allium fistulosum. Variety name Onion Seeds. Non-GMO, perennial, open-pollinated, heirloom, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Shimonita Town is...
Agastache Seeds - Arizona Sun
77-84 Days to maturity. Agastache x hybrida’Arizona Sun’. Arizona Sun Agastache Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, Perennial. Open Pollinated. Arizona Sun Agastache is a rare fragrant and showy, yet...
Onion Seeds - Bunching - Heshiko (Treated)
60-80 Days to maturity. Allium fistulosum. Heshiko Treated Onion Seeds (Thiram fungicide). Non-GMO, perennial, open-pollinated, heirloom, cold tolerant, drought tolerant, bunching onion. Suitable for growing in greenhouses, garden plots, raised...
Roselle Seeds - Asian Sour Leaf (Hibiscus)
70-90 day maturity. Hibiscus sabdariffa. Asian Sour Leaf Roselle Seeds. Non-GMO, Cool-season perennial heirloom. This unique perennial can be grown as an annual in areas where it will not survive...
Spinach Seeds - Red Malabar
70 days. Basella rubra. Red Malabar Spinach Seeds. Non-GMO, warm-season annual, heirloom, open-pollinated. This crop is suitable for trellised garden plots, raised beds, and large containers. Red Malabar is a...
Dandelion Seeds - True (Wild)
Taraxacum officinale. Non-GMO, Heirloom True (Wild) Dandelion Herb Garden Seed from True Leaf Market. True wild Dandelions grow as tender perennials native to regions in Asia and Europe. Herbaceous and...
Agastache Seeds - Korean Mint
55-65 days to maturity. Agastache rugosa. Korean Mint Agastache Seeds. Non-GMO, Heirloom, Perennial in Zones 4-9. Korean Mint is a drought-tolerant aromatic herb in the mint family that is native...
Toraji Seeds - Balloon Flower
90-120 days to maturity Platycodon grandiflorus (Jacq.) A. DC. Balloon Flower Toraji Seeds. Non-GMO, Heirloom. Perennial in Zones 3-8. Roots can be harvested after 2-3 years. Balloon Flower can also...
Coffee Seeds - Coffea Arabica Nana
About 3-4 years to harvest. Coffea arabica 'Nana'. Nana Arabian Coffee Seeds. Non-GMO, perennial, open-pollinated, tropical, dwarf coffee tree. Nana Arabian Coffee tree seeds grow dwarf coffee plants that will...
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