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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
377 Items
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Buckwheat (Organic) - Microgreens SeedsBuckwheat (Organic) - Microgreens Seeds
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Organic
Buckwheat (Organic) - Microgreens Seeds
Starting at $10.61
Radish - Triton Purple - Microgreens SeedsRadish - Triton Purple - Microgreens Seeds
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Starting at $2.99
Pea Sprouting SpeckledPea Sprouting Speckled Organic
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Pea - Speckled - Microgreens Seeds
Starting at $8.41
Radish Seeds - Microgreen - Sango PurpleRadish Seeds - Microgreen - Sango Purple
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Staff Favorite
Radish Seeds - Microgreen - Sango Purple
Starting at $3.99
Corn - Yellow Popcorn (Organic) - Microgreens SeedsCorn - Yellow Popcorn (Organic) - Microgreens Seeds
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Heirloom
Organic
Corn - Yellow Popcorn (Organic) - Microgreens Seeds
Starting at $9.88
Cantaloupe - Microgreens SeedsCantaloupe - Microgreens Seeds
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Cantaloupe - Microgreens Seeds
Starting at $7.14
Broccoli Seeds - Di Cicco - Organic - Microgreens Seedsmid size pouch type seed packaging for - Broccoli Di Cicco Organic Microgreens
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Broccoli Seeds - Di Cicco - Organic - Microgreens Seeds
Starting at $7.16
Cilantro Seeds - Leisure Splits (Organic) - Microgreens SeedsCilantro Seeds - Leisure Splits (Organic) - Microgreens Seeds
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Staff Favorite
Cilantro Seeds - Leisure Splits (Organic) - Microgreens Seeds
Starting at $6.25
custom designed bag packaging for Azomite - Trace Mineral Organic FertilizerAzomite - Trace Mineral Organic Fertilizer
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Starting at $6.86
Micro Mat Hydroponic Grow PadsMicro Mat Hydroponic Grow Pads
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Micro Mat Hydroponic Grow Pads
Starting at $20.39
Radish - Purple - Microgreens SeedsRadish - Purple - Microgreens Seeds
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Heirloom
Radish - Purple - Microgreens Seeds
Starting at $7.28
Broccoli - Microgreens SeedsBroccoli - Microgreens Seeds
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Broccoli - Microgreens Seeds
Starting at $6.20
Pea - Dundale, Dun Pea (Organic) - MicrogreensPea - Dundale, Dun Pea (Organic) - Microgreens
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Starting at $3.59
Basic Salad Mix (Organic) - Microgreens SeedsBasic Salad Mix (Organic) - Microgreens Seeds
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Basic Salad Mix (Organic) - Microgreens Seeds
Starting at $7.52
1020 Heavy Duty Microgreens Trays - No Holes - Black - Shallow1020 Heavy Duty Microgreens Trays - No Holes - Black - Shallow
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1020 Heavy Duty Microgreens Trays - No Holes - Black...
Starting at $14.69
Pak Choi - White Stem - Microgreens SeedsPak Choi - White Stem - Microgreens Seeds
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Starting at $5.78
Sectional Hydroponic Microgreens Starter KitSectional Hydroponic Microgreens Starter Kit
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$82.56
Minute Soil Plus Block 1custom packaging for Minute Soil+ - Amended Compressed Coco Coir
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Minute Soil+ - Amended Compressed Coco Coir Blocks
Starting at $26.01
10 x 20 Clear Humidity Dome10 x 20 Clear Humidity Dome
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Broccoli - Waltham 29 - Organic - Microgreens SeedsBroccoli - Waltham 29 - Organic - Microgreens Seeds
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Beet - Microgreens SeedsBeet - Microgreens Seeds
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Starting at $5.30
Cress - Curled - Microgreens SeedsCress - Curled - Microgreens Seeds
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Kale - Vates Blue Scotch Curled - Microgreens SeedsKale - Vates Blue Scotch Curled - Microgreens Seeds
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Mustard - Spicy Oriental (Organic) - Microgreens SeedsMustard - Spicy Oriental (Organic) - Microgreens Seeds
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Amaranth - Red Garnet (Organic) - Microgreens SeedsAmaranth - Red Garnet (Organic) - Microgreens Seeds
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Sunflower - Black Oil (Organic) - Microgreens SeedsSunflower - Black Oil (Organic) - Microgreens Seeds
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custom box packaging for largest size options of Jiffy Peat PelletsJiffy-7 Peat Seed Starting Pellets (Organic)
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Brussels Sprouts - Long Island Improved - Microgreens Seeds
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Parsley - Dark Green Italian Flat-leaf - Microgreens Seeds
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Potting Soil Mix - OMRI Certified for Organic Use
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Mustard - Southern Giant Curled - Microgreens Seeds
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Swiss Chard - Rainbow Mixture - Microgreens Seeds
Starting at $8.30
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