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
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358 Items
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Lettuce Leaf - Ruby Red - Microgreens SeedsLettuce Leaf - Ruby Red - Microgreens Seeds
-0
Heirloom
Lettuce Leaf - Ruby Red - Microgreens Seeds
Starting at $10.34
Shiso Herb (Perilla) - Korean - Microgreens Seeds
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Starting at $14.34
Hollyhock Seeds - Queeny Purplemid size pouch type seed packaging for - Hollyhock Queeny Purple
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AAS Winner
Hollyhock Seeds - Queeny Purple
Starting at $3.79
Beet Seeds - Boltardy
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Heirloom
Beet Seeds - Boltardy
Starting at $2.99
China Aster Seeds - Single Rainbow MixChina Aster Seeds - Single Rainbow Mix
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China Aster Seeds - Single Rainbow Mix
Starting at $2.99
Sweet Pea Seeds - High ScentSweet Pea Seeds - High Scent
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Sweet Pea Seeds - High Scent
Starting at $3.39
Brachycome Seeds - Splendor Mixmid size pouch type seed packaging for - Brachycome Splendor Mix
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Brachycome Seeds - Splendor Mix
Starting at $2.99
Alternanthera - Purple Knightmid size pouch type seed packaging for - Alternanthera Purple Knight
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Starting at $4.79
Pak Choi Seeds - Red Kingdom - Hybridmid size pouch type seed packaging for - Pak Choi Red Kingdom Hybrid
-50%
Pak Choi Seeds - Red Kingdom - Hybrid
Starting at $1.99
Corn Seeds - Popcorn - Glass Gem (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
-48%
Organic
Corn Seeds - Popcorn - Glass Gem (Organic)
Starting at $1.99
Lettuce Seeds - Romaine - Iya Solsmall size packet type seed packaging for - Lettuce Romaine Iya Sol
-0
Heirloom
Lettuce Seeds - Romaine - Iya Sol
Starting at $2.99
Chinese Cabbage Seeds - RCC9 Red - Hybridmid size pouch type seed packaging for - Chinese Cabbage RCC9 Red Hybrid
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National Wildflower Collection - 6 Wildflower Mixes for PollinatorsNational Wildflower Collection - 6 Wildflower Mixes for Pollinators
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National Wildflower Collection - 6 Wildflower Mixes for Pollinators
$48.10
Lettuce Leaf - Red Sails - Microgreens SeedsLettuce Leaf - Red Sails - Microgreens Seeds
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Staff Favorite
Lettuce Leaf - Red Sails - Microgreens Seeds
Starting at $9.37
Wildflower Seeds - Deer Resistant MixWildflower Seeds - Deer Resistant Mix
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Wildflower Seeds - Deer Resistant Mix
Starting at $3.99
Hot Radish Seeds - Aka (Red) Karaine - Hybridmid size pouch type seed packaging for - Hot Radish Aka Red Karaine Hybrid
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Hot Radish Seeds - Aka (Red) Karaine - Hybrid
Starting at $3.99
Chinese Cabbage Seeds - RCC3 Red - Hybridmid size pouch type seed packaging for - Chinese Cabbage RCC3 Red Hybrid
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Chinese Cabbage Seeds - RCC3 Red - Hybrid
Starting at $3.99
Pak Choi Seeds - Da Hong Winter Hybridmid size pouch type seed packaging for - Pak Choi Da Hong Winter Hybrid
-50%
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Starting at $1.99
Tomato Seeds - Slicing - Black Prince
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Tomato Seeds - Slicing - Black Prince
Starting at $3.29
Basil Seeds - Ornamental Mixturesmall size packet type seed packaging for - Basil Ornamental Mixture
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Basil Seeds - Ornamental Mixture
Starting at $2.99
Mustard Ruby Streakmid size pouch type seed packaging for - Mustard Ruby Streak
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Basil Seeds - Red Rubin (Organic) - Microgreens SeedsBasil Seeds - Red Rubin (Organic) - Microgreens Seeds
-34%
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Starting at $13.62
Mustard Seeds - Jeok Gatmid size pouch type seed packaging for - Mustard Jeok Gat
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Starting at $3.99
Shiso Herb Seeds (Perilla) - Jeok Ssam Ip
Starting at $3.99
Shiso Seeds - Bicolor (Organic)
Starting at $3.59
Pepper Seeds - Hot - Holy Mole Hybrid
Starting at $4.29
Columbine Seeds - Double Mixed
Starting at $2.99
Bean Seeds - Bush - Mardi Gras Mix (Organic)
Starting at $3.69
Mixed Greens - Braising Mix (Organic)
Starting at $3.59
Lupine Seeds - Sundial
Starting at $2.99
Mustard Seeds - Scarlet Frill - Hybrid
Starting at $2.79
Pepper Seeds - Sweet - Rosé Hybrid
Starting at $4.09
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