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
1078 Items
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Pea Seeds - Snow - Oregon Giant (Organic)small size packet type seed packaging for - Pea Snow Oregon Giant Organic
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Mustard Seeds - Red TatsoiMustard Seeds - Red Tatsoi
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Radish Seeds - Red Daikon (Ostergruss Rosa)Radish Seeds - Red Daikon (Ostergruss Rosa)
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California Poppy Seeds - Mikado Red
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Spinach Seeds - Dash - Hybrid
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Lettuce Seeds - Leaf - Oakleaf - Redsmall size packet type seed packaging for - Lettuce Leaf Oakleaf Red
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Broccoli Raab - Early Fall Rapinimid size pouch type seed packaging for - Broccoli Raab Early Fall Rapini
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Turnip Seeds - Kanamachimid size pouch type seed packaging for - Turnip Kanamachi
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Onion Seeds - Short - Eclipse L303small size packet type seed packaging for - Onion Short Eclipse L303
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Mustard Seeds - Da Ping Pumid size pouch type seed packaging for - Mustard Da Ping Pu
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Grass Mix - Irrigated Pasture Seedmid size pouch type seed packaging for - Grass Mix Irrigated Pasture
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Celery Seeds - Giant Golden Pascalmid size pouch type seed packaging for - Celery Giant Golden Pascal
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Lettuce Seeds - Butterhead - Specklessmall size packet type seed packaging for - Lettuce Butterhead Speckles
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Mustard Choho Hybrid Mustard Choho Hybrid
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Mustard Seeds - Mibunasmall size packet type seed packaging for - Mustard Mibuna
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Turnip Seeds - Golden Globe (Organic)small size packet type seed packaging for - Turnip Golden Globe Organic
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Turnip Seeds - Oasis - Hybridmid size pouch type seed packaging for - Turnip Oasis Hybrid
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Geum Seeds - Mrs. Bradshawmid size pouch type seed packaging for - Geum Mrs Bradshaw
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Pea Seeds - Snap - Sugar Lace II (treated)mid size pouch type seed packaging for - Pea Snap Sugar Lace II treated
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Radish Seeds - Purple Plum - Organicsmall size packet type seed packaging for - Radish Purple Plum Organic
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Broccoli Seeds - Purple Sprouting (Organic)Broccoli Seeds - Purple Sprouting (Organic)
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Rhubarb Crowns - Spring - Canadian Red
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Asparagus Crowns - Sweet Purple
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Rhubarb Crowns - Spring - Valentine
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Onion Seeds - Bunching - Crimson Forest
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Onion Seeds - Short - Borettana Yellow Cipollini
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