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
4042 Items
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Melon Seeds - Canary Yellowmid size pouch type seed packaging for - Melon Canary Yellow
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Heirloom
Melon Seeds - Canary Yellow
Starting at $2.99
Zinnia Seeds - Profusion Series (Coated)Zinnia Seeds - Profusion Series (Coated)
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Starting at $3.59
Carrot Seeds - Chantenay Red Coremid size pouch type seed packaging for - Carrot Chantenay Red Core
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Carrot Seeds - Chantenay Red Core
Starting at $2.99
Bean Seeds - Pole - Kentucky Wonder (Organic)mid size pouch type seed packaging for - Bean Pole Kentucky Wonder Organic
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Pea Seeds - Snap - Sugar Sprintmid size pouch type seed packaging for - Pea Snap Sugar Sprint
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Pea Seeds - Snap - Sugar Sprint
Starting at $3.39
Pepper Seeds - Sweet - Marconi Redsmall size packet type seed packaging for - Pepper Sweet Marconi Red
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Pepper Seeds - Sweet - Marconi Red
Starting at $2.99
Radicchio Seeds - Palla Rosamid size pouch type seed packaging for - Radicchio Palla Rosa
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Mustard - Osaka Purple - Microgreens SeedsMustard - Osaka Purple - Microgreens Seeds
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Mustard - Osaka Purple - Microgreens Seeds
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Watermelon Seeds - Giant - Black Diamondsmall size packet type seed packaging for - Watermelon Giant Black Diamond
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Watermelon Seeds - Giant - Black Diamond
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Asclepias Seeds - Butterfly Milkweedmid size pouch type seed packaging for - Asclepias Butterfly Milkweed
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Asclepias Seeds - Butterfly Milkweed
Starting at $3.19
Cabbage Seeds - All Seasons Cabbagesmall size packet type seed packaging for - Cabbage All Seasons Cabbage
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Cabbage Seeds - All Seasons Cabbage
Starting at $2.79
Mustard - Farmer's Favorite Cover Crop Mixmid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Mustard - Farmer's Favorite Cover Crop Mix
Starting at $5.69
Swiss Chard Seeds - Fordhook Giantmid size pouch type seed packaging for - Swiss Chard Fordhook Giant
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Swiss Chard Seeds - Fordhook Giant
Starting at $2.99
Squash Seeds - Honeynutmid size pouch type seed packaging for - Squash Honeynut
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Squash Seeds - Honeynut
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Clover Seeds - Medium Redmid size pouch type seed packaging for - Clover Medium Red
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Clover Seeds - Medium Red
Starting at $3.45
Pansy Seeds - Delta Premium SeriesPansy Seeds - Delta Premium Series
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Tomato Seeds - Slicing - Mortgage Liftermid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Tomato Seeds - Slicing - Mortgage Lifter
Starting at $3.39
Onion (Organic) - Microgreens SeedsOnion (Organic) - Microgreens Seeds
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Beet Seeds - Chioggia (Organic)small size packet type seed packaging for - Beet Chioggia Organic
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Starting at $3.59
Zinnia Seeds - Magellan Series (Coated)Zinnia Seeds - Magellan Series (Coated)
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Broccoli - Calabrese Green Sprouting (Organic) - Microgreens SeedsGreen Calabrese Broccoli Micros
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Starting at $6.94
Tomato Seeds - Slicing - Beefmaster HybridTomato Seeds - Slicing - Beefmaster Hybrid
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Tomato Seeds - Slicing - Beefmaster Hybrid
Starting at $4.79
Cumin SeedsCumin Seeds
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Cumin Seeds
Starting at $2.99
Pea Seeds - Snap - Sugar Daddymid size pouch type seed packaging for - Pea Snap Sugar Daddy
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Starting at $3.29
Tray Insert - 288 PlugTray Insert - 288 Plug
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Starting at $25.24
Broccoli Raab Spring Raab RapiniBroccoli Raab Spring Rapini
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Broccoli Raab Seeds - Spring Rapini
Starting at $2.99
Pepper Seeds - Hot - Large Red Cherry Hotmid size pouch type seed packaging for - Pepper Hot Large Red Cherry Hot
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Rye - Winter (Organic) - Sprouting SeedsRye - Winter (Organic) - Sprouting Seeds
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Rye - Winter (Organic) - Sprouting Seeds
Starting at $3.49
Snapdragon Seeds - Rocket SeriesSnapdragon Seeds - Rocket Series
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Clover Trio Cover Crop Seed MixClover Trio Cover Crop Seed Mix
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Clover Trio Cover Crop Seed Mix
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Parsnip Seeds - Harris Model
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Yarrow Seeds - Red
$2.99
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