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
2354 Items
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Corn Seeds - Dent - Truckers Favorite Whitemid size pouch type seed packaging for - Corn Dent Truckers Favorite White
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Starting at $3.69
Squash Seeds - Summer - Scallop Yellow Bushsmall size packet type seed packaging for - Squash Scallop Yellow Bush
-33%
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Squash Seeds - Summer - Scallop Yellow Bush
Starting at $1.99
Kale Seeds - Dazzling Bluesmall size packet type seed packaging for - Kale Dazzling Blue
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Kale Seeds - Dazzling Blue
Starting at $3.69
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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Tomato Seeds - Slicing - Super Fantastic Hybrid
Starting at $4.29
Pepper Seeds - Hot - Scotch Bonnet Redmid size pouch type seed packaging for - Pepper Hot Scotch Bonnet Red
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Pepper Seeds - Hot - Scotch Bonnet Red
Starting at $3.39
Gourd Seeds, Bitter - Green Skinmid size pouch type seed packaging for - Gourd Bitter Green Skin
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Starting at $3.99
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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Lettuce Seeds - Butterhead - Way-A-Head
Starting at $2.99
Amaranth Seeds - Red Leaf - Hu Hsienmid size pouch type seed packaging for - Amaranth Red Leaf Hu Hsien
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Amaranth Seeds - Red Leaf - Hu Hsien
Starting at $3.99
Beet Seed - White Detroitsmall size packet type seed packaging for - Beet White Detroit
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Beet Seed - White Detroit
Starting at $3.59
Bean Seeds - Pole - Kentucky Wonder
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Heirloom
Bean Seeds - Pole - Kentucky Wonder
Starting at $3.09
Cucumber Seeds - Burpless Bush Slicer F1small size packet type seed packaging for - Cucumber Burpless Bush Slicer F1
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Cucumber Seeds - Burpless Bush Slicer F1
Starting at $4.29
Beet Seeds - Gourmet Blendsmall size packet type seed packaging for - Beet Gourmet Blend
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Beet Seeds - Gourmet Blend
Starting at $2.99
Tomato Seeds - Slicing - Bonny Bestmid size pouch type seed packaging for - Tomato Slicing Bonny Best
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Tomato Seeds - Slicing - Bonny Best
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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Starting at $3.09
Lettuce Seeds - Romaine - Petite Rougesmall size packet type seed packaging for - Lettuce Romaine Petite Rouge
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Bean Seeds - Bush - Cherokee Black Waxsmall size packet type seed packaging for - Bean Bush Cherokee Black Wax
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Bean Seeds - Bush - Cherokee Black Wax
Starting at $1.99
Garlic Bulbs - Fall - Softneck - TransylvanianGarlic Bulbs - Fall - Softneck - Transylvanian
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$16.88
Cucumber Seeds - Beit Alpha F1 CMR/MMRCucumber Seeds - Beit Alpha F1 CMR/MMR
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Starting at $3.99
Pak Choi Seeds - Dwarf White Stemmid size pouch type seed packaging for - Pak Choi Dwarf White Stem
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Pak Choi Seeds - Dwarf White Stem
Starting at $3.99
Cabbage Seeds - Early Jersey Wakefieldsmall size packet type seed packaging for - Cabbage Early Jersey Wakefield
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Cabbage Seeds - Early Jersey Wakefield
Starting at $2.99
Eggplant Seeds - Thai Roundmid size pouch type seed packaging for - Eggplant Thai Round
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Eggplant Seeds - Thai Round
Starting at $3.99
Bean Seeds - Bush - Tenderette Greenmid size pouch type seed packaging for - Bean Bush Tenderette Green
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Bean Seeds - Bush - Tenderette Green
Starting at $2.63
Gourd Seeds, Bitter - Joy Green - Hybridmid size pouch type seed packaging for - Gourd Bitter Joy Green Hybrid
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Broccoli Seeds - Chinese Broccoli - Late Jade - Hybridmid size pouch type seed packaging for - Broccoli Chinese Broccoli Late Jade Hybrid
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Beet Seeds - Red Ace Hybridsmall size packet type seed packaging for - Beet Red Ace Hybrid
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Starting at $3.99
Lettuce Seeds - Tom Thumb - Organicsmall size packet type seed packaging for - Lettuce Tom Thumb Organic
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Starting at $3.59
Carrot Seeds - Solar Yellow - Organicsmall size packet type seed packaging for - Carrot Solar Yellow Organic
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Starting at $3.59
Watermelon Seeds - Picnic - Dixie Queenmid size pouch type seed packaging for - Watermelon Picnic Dixie Queen
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Watermelon Seeds - Picnic - Dixie Queen
Starting at $2.99
Bean Seeds - Pole - King of the Garden Lima
Starting at $3.14
Melon Seeds - Casaba - Golden Beauty
Starting at $2.99
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