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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697 Items
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Borage Seeds (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Heirloom
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Starting at $3.59
The True Leaf Market Herb Growing GuideThe True Leaf Market Herb Growing Guide
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Tomatillo Seeds - Aunt Molly'smid size pouch type seed packaging for - Tomatillo Aunt Mollys
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Starting at $2.99
Seed Assortment - 14 Variety Fall & Winter Vegetable CollectionSeed Assortment - 14 Variety Fall & Winter Vegetable Collection
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Radish - Red Stem - Microgreens SeedsRadish - Red Stem - Microgreens Seeds
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Starting at $3.09
Spinach Seeds - Matador Vikingsmall size packet type seed packaging for - Spinach Matador Viking
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Spinach Seeds - Matador Viking
Starting at $2.99
Kale Seeds - Portuguesesmall size packet type seed packaging for - Kale Portuguese
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Kale Seeds - Portuguese
Starting at $2.99
Market Garden Seeds CollectionMarket Garden Seeds Collection
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Mustard Seeds - Black Knight Tatsoi - Microgreen SeedsMustard Seeds - Black Knight Tatsoi - Microgreen Seeds
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Starting at $5.65
Organic Heirloom Seed Assortment - 10 PackSeed Assortment Organic Vegetable
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$23.52
Coco Coir Fiber - 10x20 Hydroponic Grow Mats
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Coco Coir Fiber - 10x20 Hydroponic Grow Mats
Starting at $25.72
Tomatillo Seeds - Cape Gooseberry Large Fruitsmall size packet type seed packaging for - Tomatillo Cape Gooseberry Large Fruit
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Tomatillo Seeds - Cape Gooseberry Large Fruit
Starting at $2.99
Pea Seeds - Snap - CascadiaPea Seeds - Snap - Cascadia
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Pea Seeds - Snap - Cascadia
Starting at $2.99
Radish - Hong Vit - Microgreen SeedsRadish - Hong Vit - Microgreen Seeds
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Radish - Hong Vit - Microgreen Seeds
Starting at $3.99
French Marigold Seeds - Dainty MariettaFrench Marigold Seeds - Dainty Marietta
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French Marigold Seeds - Dainty Marietta
Starting at $3.09
Leek Seeds - Carentan - MicrogreensLeek Seeds - Carentan - Microgreens
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Starting at $5.75
Zinnia Seeds - Pollinator Flower Mixsmall size packet type seed packaging for - Zinnia Pollinator Flower Mix
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Starting at $2.99
Lupine Seeds - Sweet Lupine - MoonshineLupine Seeds - Sweet Lupine - Moonshine
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Starting at $2.99
Mint Seeds - Pennyroyal
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Mint Seeds - Pennyroyal
Starting at $3.79
Basil Seeds - Culinary Blendsmall size packet type seed packaging for - Basil Culinary Blend
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Basil Seeds - Culinary Blend
Starting at $3.29
Wildflower Seeds - Dryland PollinatorsWildflower Seeds - Dryland Pollinators
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1020 Clear Humidity Dome - Extra Strength1020 Clear Humidity Dome - Extra Strength
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1020 Clear Humidity Dome - Extra Strength
Starting at $24.95
Tarragon Seeds - Mexicansmall size packet type seed packaging for - Tarragon Mexican
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Tarragon Seeds - Mexican
Starting at $3.69
Cosmos Seeds - Sea ShellsCosmos Seeds - Sea Shells
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Starting at $2.99
Leek Seeds - Giant MusselburghLeek Seeds - Giant Musselburgh
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Starting at $2.99
SPECIAL EDITION Harvest Orange 1020 Heavy Duty Garden TraySPECIAL EDITION Harvest Orange 1020 Heavy Duty Garden Tray
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SPECIAL EDITION Harvest Orange 1020 Heavy Duty Garden Tray
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Tray Insert - 12 Cell TraysTray Insert - 12 Cell Trays
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Kale Seeds - White Russian - Microgreens
Starting at $6.68
Seed Potatoes - Spring - Red Pontiac (Organic)
Starting at $19.33
Kale Seeds - Garden Blend
Starting at $2.99
Wildflower Seed Shaker - Hummingbird & Butterfly
$13.25 $14.88
Asparagus Crowns - Spring - Mary Washington
Starting at $7.47
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