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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Pak Choi - White Stem - Microgreens SeedsPak Choi - White Stem - Microgreens Seeds
-0
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Starting at $5.78
Sprouting Jar KitsSprouting Jar Kits
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Carrot Seeds - Scarlet Nantesmid size pouch type seed packaging for - Carrot Scarlet Nantes
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Onion Seeds - Short - Red Creolesmall size packet type seed packaging for - Onion Short Red Creole
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Minute Soil Plus Block 1Minute Soil+ - Amended Compressed Coco Coir Blocks
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Begonia Seeds - Tuberous - Nonstop Series (Pelleted)Begonia Seeds - Tuberous - Nonstop Series (Pelleted)
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Starting at $4.69
Pepper Seeds - Hot - Cayenne Long SlimPepper Seeds - Hot - Cayenne Long Slim
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10 x 20 Clear Humidity Dome10 x 20 Clear Humidity Dome
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Arugula Seeds - Slow BoltArugula Seeds - Slow Bolt
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Sectional Hydroponic Microgreens Starter KitSectional Hydroponic Microgreens Starter Kit
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12lb Beginners Dozen Sprout Seeds12lb Beginners Dozen Sprout Seeds
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Beet - Microgreens SeedsBeet - Microgreens Seeds
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Cucumber Seeds - Munchermid size pouch type seed packaging for - Cucumber Muncher
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Starting at $2.99
Mustard - Southern Giant Curled - Microgreens SeedsMustard - Southern Giant Curled - Microgreens Seeds
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Moringa Seeds
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Corn Seeds - Sweet - Ambrosia F1 Hybridmid size pouch type seed packaging for - Corn Sweet Ambrosia Hybrid
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Squash Seeds - Winter - Waltham Butternut (Organic)small size packet type seed packaging for - Squash Winter Waltham Butternut Organic
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Starting at $3.59
Radish Seeds - Cherry Belle (Organic)Radish Seeds - Cherry Belle (Organic)
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Starting at $3.39
Sage Seeds - Broad Leaved (Organic)small size packet type seed packaging for - Sage Broad Leaved Organic
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Starting at $3.59
Broccoli Sprouting KitBroccoli Sprouting Kit
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Starting at $16.41
Thyme Seeds - CommonThyme Seeds - Common
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Starting at $2.99
Kale Seeds - Red Russiansmall size packet type seed packaging for - Kale Red Russian
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Crimson Clover - Organic - Cover Crop SeedsCrimson Clover - Organic - Cover Crop Seeds
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Sunflower - Black Oil (Organic) - Microgreens SeedsSunflower - Black Oil (Organic) - Microgreens Seeds
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custom designed box packaging for Sprout Garden - 3 Tray Stackable Seed SprouterSprout Garden - 3 Tray Stackable Seed Sprouter
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$33.21 $34.31
Mustard - Spicy Oriental (Organic) - Microgreens SeedsMustard - Spicy Oriental (Organic) - Microgreens Seeds
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Pepper Sweet Emerald Giant Organicmid size pouch type seed packaging for - Pepper Sweet Emerald Giant
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Starting at $2.99
Echinacea - Purple Coneflower Seedsmid size pouch type seed packaging for - Echinacea Purple Coneflower
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Kale - Dwarf Vates Blue Scotch Curled - Microgreens SeedsKale - Dwarf Vates Blue Scotch Curled - Microgreens Seeds
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Swiss Chard - Rainbow Mixture - Microgreens SeedsSwiss Chard - Rainbow Mixture - Microgreens Seeds
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Bean Seeds - Bush - BeSweet Edamame Soybean
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