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
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Rye - Winter (Organic) - Grass SeedsRye - Winter (Organic) - Grass Seeds
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Starting at $7.84
Lemon Balm - Microgreens SeedsLemon Balm - Microgreens Seeds
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Starting at $11.41
Tomato Seeds - Cherry - Fox Cherry (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Tomato Seeds - Cherry - Fox Cherry (Organic)
Starting at $3.59
Bean Seeds - Bush - Tendergreensmall size packet type seed packaging for - Bean Bush Tendergreen
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1020 Heavy Duty Microgreens Trays - No Holes - Blue - Shallow
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1020 Heavy Duty Microgreens Trays - No Holes - Blue...
Starting at $16.79
Pepper Seeds - Sweet - Canary Bell
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Starting at $2.99
Lettuce Seeds - Leaf - Royal Oakleaf
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Kohlrabi - Early White Vienna - Microgreens SeedsKohlrabi - Early White Vienna - Microgreens Seeds
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Petunia Seeds - Frost Series (Pelleted)Petunia Seeds - Frost Series (Pelleted)
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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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Windowsill Self Watering Microgreens KitWindowsill Self Watering Microgreens Kit
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Organic
Staff Favorite
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$16.36
Green Lentils (Organic) - Bulk GrainsGreen Lentils (Organic) - Bulk Grains
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Starting at $6.64
Mustard Seeds -  Japanese Red Giantmid size pouch type seed packaging for - Mustard Japanese Red Giant
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Mustard Seeds - Japanese Red Giant
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Squash Seeds - Summer - Bennings Green Tint Scallopmid size pouch type seed packaging for - Squash Summer Bennings Green Tint Scallop
-33%
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Squash Seeds - Summer - Bennings Green Tint Scallop
Starting at $1.99
Sunflower Seeds - Chocolate Cherrysmall size packet type seed packaging for - Sunflower Chocolate Cherry
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Sunflower Seeds - Chocolate Cherry
Starting at $2.99
Valerian Seedsmid size pouch type seed packaging for - Valerian
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Valerian Seeds
Starting at $3.69
Hairy Vetch - Organic - Cover Crop SeedsHairy Vetch - Organic - Cover Crop Seeds
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Carrot Seeds - Little Fingers - Organicsmall size packet type seed packaging for - Carrot Little Fingers Organic
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Melon Seeds - Cantaloupe - Honey Rocksmall size packet type seed packaging for - Melon Cantaloupe Honey Rock
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AAS Winner
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Melon Seeds - Cantaloupe - Honey Rock
Starting at $2.99
Parsley Seeds - Japanese Mitsubamid size pouch type seed packaging for - Parsley Japanese Mitsuba
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Basil Seeds - Sweet (Organic) - MicrogreensBasil Seeds - Sweet (Organic) - Microgreens
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Flower Seeds - Beneficial Bug Mixsmall size packet type seed packaging for - Flower Beneficial Bug Mix
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Starting at $2.99
Lettuce Seeds - Leaf - Red Sails (Organic)small size packet type seed packaging for - Lettuce Leaf Red Sails Organic
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Squash Seeds - Summer - Scallop Yellow Bush (Organic)mid size pouch type seed packaging for - Squash Summer Scallop Yellow Bush Organic
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Starting at $3.59
Barley - Organic - Cover Crop Seedsmid size pouch type seed packaging for - Barley Organic Cover Crop
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Starting at $5.91
Cucumber Seeds - Rhinish PickleCucumber Seeds - Rhinish Pickle
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Kale Seeds - Black Magicsmall size packet type seed packaging for - Kale Black Magic
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Nasturtium Seeds - Alaska - Microgreens SeedsNasturtium Seeds - Alaska - Microgreens Seeds
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Starting at $7.09
Onion Sets - Super Sweet/Stuttgarter Yellow
$6.48 $12.95
Soybean - Black (Organic) - Sprouting Seeds
Starting at $10.56
Pepper Seeds - Hot - Poblano Ancho Grande
Starting at $2.99
Mustard Seeds - Mizuna Red Streaks
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