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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
1078 Items
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Mighty Mustard® Kodiak - Cover Crop Seedsmid size pouch type seed packaging for - Mighty Mustard® Kodiak Cover Crop
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Mighty Mustard® Kodiak - Cover Crop Seeds
Starting at $6.06
Spinach Seeds - Red Aztec - Organicsmall size packet type seed packaging for - Spinach Red Aztec Organic
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$3.59
Lettuce Seeds - Summer 38 Celtucemid size pouch type seed packaging for - Lettuce Summer 38 Celtuce
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Lettuce Seeds - Summer 38 Celtuce
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Spinach Seeds - Strawberry - Organicsmall size packet type seed packaging for - Spinach Strawberry Organic
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Chinese Cabbage Seeds - Kyoto No. 3mid size pouch type seed packaging for - Chinese Cabbage Kyoto No 3
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Chinese Cabbage Seeds - Kyoto No. 3
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Lettuce Seeds - Red Iceberg (Organic)small size packet type seed packaging for - Lettuce Red Iceberg Organic
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Lettuce Seeds - Red Iceberg (Organic)
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Onion Seeds - Bunching - Tokyo Long White (Organic)
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Onion Seeds - Bunching - Tokyo Long White (Organic)
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Onion Seeds - Short - Crystal White Waxmid size pouch type seed packaging for - Onion Short Crystal White Wax
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Onion Seeds - Short - Crystal White Wax
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Lettuce Seeds - Spring Mix - Organicsmall size packet type seed packaging for - Lettuce Spring Mix Organic
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Lettuce Seeds, Romaine - Vivian - Organicsmall size packet type seed packaging for - Lettuce Romaine Vivian Organic
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Endive Seeds - Red Trevisomid size pouch type seed packaging for - Endive Red Treviso
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Pak Choi Seeds - Savoy Tatsoimid size pouch type seed packaging for - Pak Choi Savoy Tatsoi
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Pak Choi Seeds - Savoy Tatsoi
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Kale Seeds - Scarletsmall size packet type seed packaging for - Kale Scarlet
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Mustard - Wasabi (Organic)Mustard - Wasabi (Organic)
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Starting at $3.99
Myosotis (Forget-Me-Not) Seeds - Sylvaticamid size pouch type seed packaging for - Myosotis Forget-Me-Not Sylvatica
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Penstemon Seeds - Rocky Mountainsmall size packet type seed packaging for - Penstemon Rocky Mountain
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Pansy Seeds - Swiss Giant Mixturesmall size packet type seed packaging for - Pansy Swiss Giant Mixture
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Dianthus Seeds - Super Parfait Series (Pelleted)Dianthus Seeds - Super Parfait Series (Pelleted)
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Starting at $4.69
Cabbage Seeds - Charleston Wakefieldsmall size packet type seed packaging for - Cabbage Charleston Wakefield
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Lettuce Seeds - Parris Island Cos - Organicsmall size packet type seed packaging for - Lettuce Parris Island Cos Organic
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Beet Seeds - Early Wonder - Organicsmall size packet type seed packaging for - Beet Early Wonder Organic
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Snapdragon Seeds - Madame Butterfly Mixturemid size pouch type seed packaging for - Snapdragon Madame Butterfly Mixture
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Iceland Poppy Seeds - Champagne Bubbles Mixmid size pouch type seed packaging for - Iceland Poppy Champagne Bubbles Mix
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Starting at $5.09
California Poppy Seeds - Formula Mix
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Pak Choi Seeds - Tasty Pagoda Purple Hybrid
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Pea Seeds - Afila Tendril - Microgreens (Organic)
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Pea Seeds - Snow - Oregon Sugar Pod II (Organic)small size packet type seed packaging for - Pea Snow Oregon Sugar Pod II Organic
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No-Till Pollinator Friendly Cover Crop Seed MixNo-Till Pollinator Friendly Cover Crop Seed Mix
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custom packaging for Hydroponic Wheatgrass Growing KitHydroponic Wheatgrass Growing Kit
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$54.84
Grass Mix - Cabin Grass Seedmid size pouch type seed packaging for - Grass Mix Cabin Grass
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Snapdragon Seeds - Maximum Mix
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Lettuce Seeds - Salad Leaf Blend
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