May is prime warm-season planting time in mild-winter zones, with soil temperatures rising and growth accelerating. This is the month to get main-season crops established outdoors, keep up with succession sowing, and set up supports before vines and tall plants take off. Watch moisture as days warm, mulch to hold soil moisture, and keep an eye out for the first big flush of pests as the garden hits its stride.

Indoors (fresh harvests):

  • Microgreens: peas, broccoli, sunflowers, arugula
  • Sprouts: alfalfa, broccoli, radish, mung
  • Herbs & greens under lights: chives, parsley, mint

Transplants to move outdoors (harden first): pepper, tomato, eggplant, melons, basil, okra — these should go out early May if not already in the ground

Crops that can be directly sown outdoors in May: beans, corn, cucumber, squash, melons, okra, sunflower, basil, dill, sweet potato slips. Succession sow beets, carrots, and radishes early in the month before heat sets in.

Cover crops: buckwheat, cowpeas, sorghum-sudangrass

Note: Warm-season crops should be going directly outdoors now, not starting under lights.

Tip: An Olympia, WA zone 8 is very different from a Jackson, MS zone 8. Consider checking with your state Extension Service office for more specific recommendations and guidelines.

Use your USDA zone as a guide. Microclimates matter — coastal/urban spots run warmer; high elevation runs colder.

50 100 true //store.trueleafmarket.com/cdn/shop/t/54/assets/review-fallback.json?v=33078429469613971781712858278
Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites
696 Items
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Hyacinth Bulbs - Blue Jacket
-0
Hyacinth Bulbs - Blue Jacket
Starting at $13.99
Pumpkin Seeds - Autumn Moon and Ghoulie Mixmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Pumpkin Seeds - Autumn Moon and Ghoulie Mix
Starting at $3.99
Rapeseed - Canola - Dwarf EssexRapeseed - Canola - Dwarf Essex
-0
Rapeseed - Canola - Dwarf Essex
Starting at $2.99
Eggplant Seeds - Purple Thai Round (Organic)mid size pouch type seed packaging for - Eggplant Purple Thai Round Organic
-44%
Heirloom
Organic
Eggplant Seeds - Purple Thai Round (Organic)
Starting at $1.99
Lettuce Seeds - Romaine - Sweet Valentinemid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Heirloom
Lettuce Seeds - Romaine - Sweet Valentine
Starting at $2.99
Corn Seeds - Sweet - Inspiration Hybridmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-68%
Corn Seeds - Sweet - Inspiration Hybrid
Starting at $1.99
Radish Seeds - Red ArrowRadish Seeds - Red Arrow
-0
Heirloom
Radish Seeds - Red Arrow
Starting at $3.99
Blue Oyster Mushroom Grain Spawn (Organic)Blue Oyster Mushroom Grain Spawn (Organic)
-0
Organic
Blue Oyster Mushroom Grain Spawn (Organic)
$29.99
Lettuce Seeds - Summertime
-0
Heirloom
Lettuce Seeds - Summertime
Starting at $2.99
Artist Chiura Obata - Kanamachi Turnip Limited Edition Seed PacketArtist Chiura Obata - Kanamachi Turnip Limited Edition Seed Packet
-0
Heirloom
Artist Chiura Obata - Kanamachi Turnip Limited Edition Seed Packet
$3.99
Grass Seeds - QuakingTrue Leaf Market Flower Seed packaging Bag
-0
Grass Seeds - Quaking
Starting at $3.39
Cotton Seeds - NankeenCotton Seeds - Nankeen
-0
Heirloom
Cotton Seeds - Nankeen
Starting at $3.39
Crocus Bulbs - Mixed Colors
-0
Crocus Bulbs - Mixed Colors
$12.99
custom packaging for Seed Starting Soil MixSeed Starting Soil Mix
-0
Seed Starting Soil Mix
Starting at $10.04
Corn Seeds - Popcorn - Miniature Colored
-0
Corn Seeds - Popcorn - Miniature Colored
Starting at $4.59
Yard Long Bean Seeds - Black (Organic)
-0
Yard Long Bean Seeds - Black (Organic)
Starting at $3.99
Sunflower Seeds - Balcony BeautySunflower Seeds - Balcony Beauty
-0
Staff Favorite
Sunflower Seeds - Balcony Beauty
Starting at $2.99
Melon Seeds - Cantaloupe - Top Markmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Heirloom
Melon Seeds - Cantaloupe - Top Mark
Starting at $2.99
Endive Seeds - Pugliesesmall size packet type seed packaging for - Endive Pugliese
-0
Heirloom
Endive Seeds - Pugliese
Starting at $2.99
Tulip Bulbs - Darwin Hybrid - Apeldoorn's Elite
-0
Tulip Bulbs - Darwin Hybrid - Apeldoorn's Elite
Starting at $17.99
Daffodil Bulbs - Large Cupped 'Ice Follies'
-0
Daffodil Bulbs - Large Cupped 'Ice Follies'
Starting at $21.99
Swiss Chard Seeds - Oriole Orangemid size pouch type seed packaging for - Zinnia Magellan Series Orange
-33%
Swiss Chard Seeds - Oriole Orange
Starting at $1.99
Pepper Seeds - Sweet - Quadrata D'Asti Rosso
-0
Heirloom
Pepper Seeds - Sweet - Quadrata D'Asti Rosso
Starting at $2.99
Nasturtium Seeds - Empress of India (Organic) - Microgreens Seeds
Starting at $10.30
Begonia Tubers - Bi-Color Picotee Mixture
$9.00 $17.99
Rhubarb Crowns - Crimson Red
Starting at $13.98
Dahlia Bulbs - Arabian Night
$9.00 $17.99
Gladiolus Bulbs - Glad you Are Here Mixture
$7.00 $13.99
Gladiolus Bulbs - Dazzling Tangerine Mixture
$7.00 $13.99
Potato - Jester (Organic)
Starting at $8.83
Chinese New Year Seed Assortment - Year of the Dragon
$21.23
Gladiolus Bulbs - Mardi Gras Mixture
$7.00 $13.99
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