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
2354 Items
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Endive Seeds - Witloof Chicorysmall size packet type seed packaging for - Endive Witloof Chicory
-0
Heirloom
Endive Seeds - Witloof Chicory
Starting at $2.99
Corn Seeds - Sweet - Serendipity Bicolor TripleSweet Hybrid (treated)mid size pouch type seed packaging for - Corn Sweet Serendipity Bicolor TripleSweet Hybrid treated
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Corn Seeds - Sweet - Serendipity Bicolor TripleSweet Hybrid (treated)
Starting at $18.43
Watermelon Seeds - Giant - Congosmall size packet type seed packaging for - Watermelon Giant Congo
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Watermelon Seeds - Giant - Congo
Starting at $2.99
Radish Seeds - Easter Egg - Organicsmall size packet type seed packaging for - Radish Easter Egg Organic
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Organic
Radish Seeds - Easter Egg - Organic
Starting at $3.59
Tomatillo Seeds - Aunt Molly'smid size pouch type seed packaging for - Tomatillo Aunt Mollys
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Starting at $2.99
Pepper Seeds - Hot - Wicked Ghost Hybridmid size pouch type seed packaging for - Pepper Hot Wicked Ghost Hybrid
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Pepper Seeds - Hot - Wicked Ghost Hybrid
Starting at $5.39
Tomato Seeds - Slicing - Golden Queen (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Starting at $3.79
Tomato Seeds - Salad - ThessalonikiTomato Seeds - Salad - Thessaloniki
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Tomato Seeds - Salad - Thessaloniki
Starting at $3.99
Bean Seeds - Bush - Jade (Treated)mid size pouch type seed packaging for - Bean Bush Jade Treated
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Starting at $15.06
Seed Assortment - 14 Variety Fall & Winter Vegetable CollectionSeed Assortment - 14 Variety Fall & Winter Vegetable Collection
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$19.27
Cucumber Seeds - Tasty Green - Hybridmid size pouch type seed packaging for - Cucumber Tasty Green Hybrid
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Starting at $3.99
Carrot Seeds - Nantes Mini CoreCarrot Seeds - Nantes Mini Core
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Carrot Seeds - Nantes Mini Core
Starting at $2.99
Tomato Seeds - Cherry - Gum Drop Black Hybridmid size pouch type seed packaging for - Tomato Cherry Gum Drop Black Hybrid
-61%
Tomato Seeds - Cherry - Gum Drop Black Hybrid
Starting at $1.99
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
Radish Seeds - Champion - Organicsmall size packet type seed packaging for - Radish Champion Organic
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Organic
Radish Seeds - Champion - Organic
Starting at $3.59
Gourd Seeds - Bitter Green - Hybridmid size pouch type seed packaging for - Gourd Bitter Green Hybrid
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Gourd Seeds - Bitter Green - Hybrid
Starting at $3.99
Pumpkin Seeds - Dickinsonsmall size packet type seed packaging for - Pumpkin Dickinson
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Pumpkin Seeds - Dickinson
Starting at $3.59
Kale Seeds - Portuguesesmall size packet type seed packaging for - Kale Portuguese
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Kale Seeds - Portuguese
Starting at $2.99
Tomato Seeds - Slicing - Hamson (DX-52-12)Tomato Seeds - Slicing - Hamson (DX-52-12)
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Tomato Seeds - Slicing - Hamson (DX-52-12)
Starting at $2.99
Pepper Seeds - Hot - Thai - Birdmid size pouch type seed packaging for - Pepper Hot Thai Bird
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Starting at $3.99
Beans - Black Turtle (Organic) - Sprouting SeedsBeans - Black Turtle (Organic) - Sprouting Seeds
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Beans - Black Turtle (Organic) - Sprouting Seeds
Starting at $8.90
Cucumber Seeds - Parisian Gherkin F1 AASsmall size packet type seed packaging for - Cucumber Parisian Gherkin F1 AAS
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AAS Winner
Cucumber Seeds - Parisian Gherkin F1 AAS
Starting at $4.49
Squash Seeds - Winter - Honeybaby Hybridmid size pouch type seed packaging for - Squash Winter Honeybaby Hybrid
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Squash Seeds - Winter - Honeybaby Hybrid
Starting at $4.39
Pepper Seeds - Sweet - Giant Marconi HybridPepper Seeds - Sweet - Giant Marconi Hybrid
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Pepper Seeds - Sweet - Giant Marconi Hybrid
Starting at $4.29
Pepper Seeds - Hot - Hungarian Yellow Wax (Organic)mid size pouch type seed packaging for - Pepper Hot Hungarian Yellow Wax Organic
-41%
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Pepper Seeds - Hot - Hungarian Yellow Wax (Organic)
Starting at $1.99
Market Garden Seeds CollectionMarket Garden Seeds Collection
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Market Garden Seeds Collection
$21.38
Pepper Seeds - Hot - Scotch Bonnet Orangesmall size packet type seed packaging for - Pepper Hot Scotch Bonnet Orange
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Pepper Seeds - Hot - Scotch Bonnet Orange
Starting at $5.09
Pepper Seeds - Hot - Pasilla Bajiomid size pouch type seed packaging for - Pepper Hot Pasilla Bajio
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Pepper Seeds - Hot - Pasilla Bajio
Starting at $3.29
Squash Seeds - Summer - Zucchini Greyzinni Hybridmid size pouch type seed packaging for - Squash Summer Zucchini Greyzinni Hybrid
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Squash Seeds - Summer - Zucchini Greyzinni Hybrid
Starting at $3.99
Tomato Seeds - Slicing - Marianna's Peacesmall size packet type seed packaging for - Tomato Slicing Mariannas Peace
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Tomato Seeds - Slicing - Marianna's Peace
Starting at $3.59
Cucumber Seeds - Green Light - Hybridmid size pouch type seed packaging for - Cucumber Green Light Hybrid
-0
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Cucumber Seeds - Green Light - Hybrid
Starting at $3.99
Gourd Seeds, Bitter - Futo - Spindle
Starting at $3.99
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