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
1006 Items
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Melon Seeds - Cantaloupe - Honey Rocksmall size packet type seed packaging for - Melon Cantaloupe Honey Rock
-0
AAS Winner
Heirloom
Melon Seeds - Cantaloupe - Honey Rock
Starting at $2.99
Mustard Seeds -  Japanese Red Giantmid size pouch type seed packaging for - Mustard Japanese Red Giant
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Carrot Seeds - Little Fingers - Organicsmall size packet type seed packaging for - Carrot Little Fingers Organic
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Organic
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Starting at $3.59
Corn Seeds - Popcorn - Yellow (Organic)mid size pouch type seed packaging for - Corn Popcorn Yellow Organic
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Corn Seeds - Popcorn - Yellow (Organic)
Starting at $3.59
Pea Seeds - Shelling - Progress No. 9mid size pouch type seed packaging for - Pea Shelling Progress No 9
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Cucumber Seeds - Dragon Suhyo Cross Hybridmid size pouch type seed packaging for - Cucumber Dragon Suhyo Cross Hybrid
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Cucumber Seeds - Asia Eun Cheon - Hybridmid size pouch type seed packaging for - Cucumber Asia Eun Cheon Hybrid
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Chinese Cabbage Seeds - Mini Napa #2 - Hybrid (Treated)mid size pouch type seed packaging for - Chinese Cabbage Mini Napa #2 Hybrid Treated
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Starting at $3.99
Pea Seeds - Shelling - Wandomid size pouch type seed packaging for - Pea Shelling Wando
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Pea Seeds - Shelling - Wando
Starting at $3.29
Lettuce Seeds - Leaf - PrizeheadLettuce Seeds - Leaf - Prizehead
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Lettuce Seeds - Leaf - Prizehead
Starting at $2.99
Lettuce Seeds - Leaf - Royal Oakleafsmall size packet type seed packaging for - Lettuce Leaf Royal Oakleaf
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Starting at $1.99
Tomato Seeds - Slicing - Giant Red Beefsteakmid size pouch type seed packaging for - Tomato Slicing Giant Red Beefsteak
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Tomato Seeds - Slicing - Giant Red Beefsteak
Starting at $2.99
Cucumber Seeds - Southern Delight - Hybridmid size pouch type seed packaging for - Cucumber Southern Delight Hybrid
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Starting at $3.99
Lettuce Seeds, Leaf - Red Sails - Organicsmall size packet type seed packaging for - Lettuce Leaf Red Sails Organic
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Tomato Seeds - Slicing - Pineapple (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Melon Seeds - Cantaloupe - Ambrosia HybridMelon Seeds - Cantaloupe - Ambrosia Hybrid
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Lettuce Seeds - Fall and Winter Mix (Organic)small size packet type seed packaging for - Lettuce Fall and Winter Mix Organic
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Starting at $3.59
Tomato Seeds - Slicing - Momotaro Hybridmid size pouch type seed packaging for - Tomato Slicing Momotaro Hybrid
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Starting at $4.99
Corn Seeds - Dent - Truckers Favorite Whitemid size pouch type seed packaging for - Corn Dent Truckers Favorite White
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Corn Seeds - Dent - Truckers Favorite White
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Lettuce Seeds - Red Oakleaf - Organicsmall size packet type seed packaging for - Lettuce Red Oakleaf Organic
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Starting at $3.59
Tomato Seeds - Slicing - Super Fantastic HybridTomato Seeds - Slicing - Super Fantastic Hybrid
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Starting at $4.29
Mighty Mustard® Pacific Gold - Cover Crop Seedssmall size packet type seed packaging for - Mighty Mustard® Pacific Gold Cover Crop
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Mighty Mustard® Pacific Gold - Cover Crop Seeds
Starting at $2.63
Onion Seeds - Intermediate - Shonan Redmid size pouch type seed packaging for - Onion Intermediate Shonan Red
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Onion Seeds - Intermediate - Shonan Red
Starting at $3.99
Lettuce Seeds - Butterhead - Way-A-Headsmall size packet type seed packaging for - Lettuce Butterhead Way-A-Head
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Starting at $2.99
Beet Seed - White Detroitsmall size packet type seed packaging for - Beet White Detroit
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Cucumber Seeds - Burpless Bush Slicer F1small size packet type seed packaging for - Cucumber Burpless Bush Slicer F1
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Beet Seeds - Gourmet Blendsmall size packet type seed packaging for - Beet Gourmet Blend
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Starting at $2.99
Corn Seeds - Dent - Truckers Favorite Yellowmid size pouch type seed packaging for - Corn Dent Truckers Favorite Yellow
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Lettuce Seeds - Romaine - Petite Rougesmall size packet type seed packaging for - Lettuce Romaine Petite Rouge
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Cucumber Seeds - Beit Alpha F1 CMR/MMRCucumber Seeds - Beit Alpha F1 CMR/MMR
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Beet - Detroit Mix (Organic) - Microgreens Seeds
Starting at $12.03
Melon Seeds - Casaba - Golden Beauty
Starting at $2.99
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