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
4042 Items
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Basil Seeds - Red Rubin - Microgreens SeedsBasil Seeds - Red Rubin - Microgreens Seeds
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Heirloom
Basil Seeds - Red Rubin - Microgreens Seeds
Starting at $11.35
Lettuce Seeds - Red Romainesmall size packet type seed packaging for - Lettuce Red Romaine
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Lettuce Seeds - Red Romaine
Starting at $2.99
Corn Seeds - Sweet - Jubilee F1 Hybridmid size pouch type seed packaging for - Corn Sweet Jubilee Hybrid
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Corn Seeds - Sweet - Jubilee F1 Hybrid
Starting at $3.99
Tomato Seeds - Cherry - Red Pearmid size pouch type seed packaging for - Tomato Cherry Red Pear
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Heirloom
Tomato Seeds - Cherry - Red Pear
Starting at $2.99
Tomato Seeds - Slicing - Brandywine Red Potato Leaf (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Tomato Seeds - Slicing - Brandywine Red Potato Leaf (Organic)
Starting at $3.59
Cucumber Seeds - Beit Alpha CMR/MMRsmall size packet type seed packaging for - Cucumber Beit Alpha CMR/MMR
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Starting at $3.69
Fenugreek (Organic) - Herb SeedsFenugreek (Organic) - Herb Seeds
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Organic
Fenugreek (Organic) - Herb Seeds
Starting at $3.59
Alyssum Seeds - Basket of Goldmid size pouch type seed packaging for - Alyssum Basket of Gold
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Alyssum Seeds - Basket of Gold
Starting at $2.99
Gomphrena Seeds - Gnome SeriesGomphrena Seeds - Gnome Series
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Gomphrena Seeds - Gnome Series
Starting at $3.69
Beet Seeds - Cylindra - Organicsmall size packet type seed packaging for - Beet Cylindra Organic
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Starting at $3.59
Bean Seeds - Black Garbanzo (Organic) - MicrogreensBean Seeds - Black Garbanzo (Organic) - Microgreens
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Organic
Bean Seeds - Black Garbanzo (Organic) - Microgreens
Starting at $3.59
Melon Seeds - Charentais (Organic)small size packet type seed packaging for - Melon Charentais Organic
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Heirloom
Organic
Melon Seeds - Charentais (Organic)
Starting at $3.89
Amaranth Seeds - Polish - Organicsmall size packet type seed packaging for - Amaranth Polish Organic
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Organic
Amaranth Seeds - Polish - Organic
$3.69
Corn Seeds - Sweet - Peaches and Cream F1 Hybrid (treated)mid size pouch type seed packaging for - Corn Sweet Peaches and Cream Hybrid treated
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Corn Seeds - Sweet - Peaches and Cream F1 Hybrid...
Starting at $16.32
Please Note that Acidic and Basic solutions come packaged in the exact same type and size of plastic bottle, for accessibility help, please contact customer service at 801-491-8700, and ask for help with product SKU 17666Microgreens pH Control Kit by General Hydroponics
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Microgreens pH Control Kit by General Hydroponics
$24.90
Cucumber Seeds - Palace Pride - Hybrid
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Cucumber Seeds - Palace Pride - Hybrid
Starting at $3.99
custom box packaging for Seed Starter Kit - SaladSeed Starter Kit - Salad
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Seed Starter Kit - Salad
Starting at $26.72
Radicchio Seeds - Rouge de Veronamid size pouch type seed packaging for - Radicchio Rouge de Verona
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Heirloom
Radicchio Seeds - Rouge de Verona
Starting at $2.99
Lettuce Seeds - Crisphead - Great Lakes Mesa 659small size packet type seed packaging for - Lettuce Crisphead Great Lakes Mesa 659
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Heirloom
Lettuce Seeds - Crisphead - Great Lakes Mesa 659
Starting at $2.99
Chinese Cabbage Seeds - Aichimid size pouch type seed packaging for - Chinese Cabbage Aichi
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Chinese Cabbage Seeds - Aichi
Starting at $3.99
Pepper Seeds - Hot - Purple TigerPepper Seeds - Hot - Purple Tiger
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Pepper Seeds - Hot - Purple Tiger
Starting at $3.99
Wildflower Seeds - Monarch Butterfly MixWildflower Seeds - Monarch Butterfly Mix
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Wildflower Seeds - Monarch Butterfly Mix
Starting at $3.09
Spinach Seeds - Lakeside - Hybrid
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Starting at $3.99
Arugula (Organic) Microgreens Seedsmid size pouch type seed packaging for - Lettuce Leaf Lollo Rosso Organic Clearance
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Arugula (Organic) Microgreens Seeds
Starting at $3.59
Cucumber Seeds - Spacemaster (Organic)small size packet type seed packaging for - Cucumber Spacemaster Organic
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Organic
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Starting at $3.59
Garbanzo Bean (Organic) - Cover Crop Seeds
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Heirloom
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Starting at $6.12
Pumpkin Seeds - Jarrahdale (Organic)mid size pouch type seed packaging for - Tomato Slicing Yellow Perfection Organic
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Starting at $3.59
Onion - Utah Yellow Sweet Spanish - Microgreens SeedsOnion - Utah Yellow Sweet Spanish - Microgreens Seeds
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Staff Favorite
Onion - Utah Yellow Sweet Spanish - Microgreens Seeds
Starting at $10.01
Lettuce Seeds - Jericho (Organic)
Starting at $4.39
Tomato Seeds - Cherry - Black Cherry (Organic)
Starting at $3.59
Onion Seeds - Short - Early White Grano PRR
Starting at $2.99
Onion Sets - Spanish Yellow
$6.48 $12.95
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