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
2353 Items
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Tomato Seeds - Slicing - Aunt Ruby's German Greenmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-28%
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Starting at $1.99
Squash Seeds - Winter - Bush Delicata (Organic)mid size pouch type seed packaging for - Squash Winter Bush Delicata Organic
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Starting at $3.79
Cucumber Seeds - Arkansas Little Leafsmall size packet type seed packaging for - Cucumber Arkansas Little Leaf
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Cucumber Seeds - Arkansas Little Leaf
Starting at $2.99
Cucumber Seeds - West Indian Gherkin
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Chinese Celery Seeds - Yellow Stemmid size pouch type seed packaging for - Chinese Celery Yellow Stem
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Chinese Celery Seeds - Yellow Stem
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Lettuce Seeds - Crisphead - Salinasmid size pouch type seed packaging for - Lettuce Crisphead Salinas
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Lettuce Seeds - Crisphead - Salinas
Starting at $3.09
Cabbage Seeds - Purple Savoysmall size packet type seed packaging for - Cabbage Purple Savoy
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Cabbage Seeds - Purple Savoy
Starting at $2.99
Tomatillo Seeds - Pineapplesmall size packet type seed packaging for - Tomatillo Pineapple
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Tomatillo Seeds - Pineapple
Starting at $3.59
Lettuce Seeds - Purple Sword Celtucemid size pouch type seed packaging for - Lettuce Purple Sword Celtuce
-50%
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Lettuce Seeds - Purple Sword Celtuce
Starting at $1.99
Mustard Seeds - Crimson Tide
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Mustard Seeds - Crimson Tide
Starting at $3.99
Tomato Seeds - Cherry - Chadwick Cherrymid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Tomato Seeds - Cherry - Chadwick Cherry
Starting at $2.99
Mustard Seeds - Mizuna Red Streaks (Organic)Mustard Seeds - Mizuna Red Streaks (Organic)
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Organic
Mustard Seeds - Mizuna Red Streaks (Organic)
Starting at $3.99
Lettuce Seeds - Butterhead - Capitainesmall size packet type seed packaging for - Lettuce Butterhead Capitaine
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Lettuce Seeds - Butterhead - Capitaine
Starting at $2.99
Melon Seeds - Collective Farm Womansmall size packet type seed packaging for - Melon Collective Farm Woman
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Melon Seeds - Collective Farm Woman
Starting at $2.99
Komatsuna Mustard Seeds - Green Boy - Hybridmid size pouch type seed packaging for - Komatsuna Mustard Green Boy Hybrid
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Starting at $3.99
Yellow Pea - Organic - Cover Crop SeedsYellow Pea - Organic - Cover Crop Seeds
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Starting at $8.37
Lentil Seeds - Black (Organic)Lentil Seeds - Black (Organic)
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Starting at $5.72
Mustard Seeds - Tat Soi - Scarlet Red (Organic)
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Starting at $3.99
Squash Seeds - Summer - Amberpic Hybridsmall size packet type seed packaging for - Squash Summer Amberpic Hybrid
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custom box packaging for Seed Starter Kit - Sweet Pepper
-34%
Heirloom
Seed Starter Kit - Sweet Pepper
$16.26 $24.99
Tomato Seeds - Slicing - Early Doll Hybridsmall size packet type seed packaging for - Tomato Slicing Early Doll Hybrid
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Starting at $3.99
Tomato Seeds - Salad - Tigerellamid size pouch type seed packaging for - Tomato Salad Tigerella
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Tomato Seeds - Salad - Tigerella
Starting at $2.99
Pumpkin Seeds - Thumpkinmid size pouch type seed packaging for - Pumpkin Thumpkin
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Pumpkin Seeds - Thumpkin
Starting at $5.29
Watermelon Seeds - Picnic - Mountain Sweetsmall size packet type seed packaging for - Watermelon Picnic Mountain Sweet
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Watermelon Seeds - Picnic - Mountain Sweet
Starting at $3.59
Corn Seeds - Golden Bantam 8mid size pouch type seed packaging for - Corn Golden Bantam 8
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Corn Seeds - Golden Bantam 8
Starting at $5.89
Beet Seeds - Ruby Queen (Organic)mid size pouch type seed packaging for - Beet Ruby Queen Organic
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Starting at $3.59
Gourd Seeds - Bitter Mara Hybrid
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Starting at $3.99
Melon Seeds - Cantaloupe - Edisto 47mid size pouch type seed packaging for - Melon Cantaloupe Edisto 47
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Starting at $2.99
Beet Seeds - Detroit Mix - Organic
Starting at $3.59
Pumpkin Seeds - Fall Rainbow Blend - Organic
Starting at $3.59
Squash Seeds - Winter - Sunshine Hybrid
Starting at $5.19
Tomato Seeds - Cherry - Isis Candy (Organic)
Starting at $3.59
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