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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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Cress Seeds - Curled (aka Garden, Pepper)Cress Seeds - Curled (aka Garden, Pepper)
-0
Heirloom
Cress Seeds - Curled (aka Garden, Pepper)
Starting at $2.99
Cabbage Seeds - Brunswicksmall size packet type seed packaging for - Cabbage Brunswick
-0
Heirloom
Cabbage Seeds - Brunswick
Starting at $2.99
Mustard Seeds - Mizuna Red LeafMustard Seeds - Mizuna Red Leaf
-0
Mustard Seeds - Mizuna Red Leaf
Starting at $3.99
Burdock Seeds - Chikosmall size packet type seed packaging for - Burdock Chiko
-0
Burdock Seeds - Chiko
Starting at $2.99
Turnip Seeds - Gold Ballsmall size packet type seed packaging for - Turnip Gold Ball
-33%
Heirloom
Turnip Seeds - Gold Ball
Starting at $1.99
Swiss Chard Seeds - Rhubarbmid size pouch type seed packaging for - Swiss Chard Rhubarb
-0
Heirloom
Swiss Chard Seeds - Rhubarb
Starting at $2.99
Carnation Seeds - Lillipot Mix (Treated)mid size pouch type seed packaging for - Carnation Lillipot Mix Treated
-0
Carnation Seeds - Lillipot Mix (Treated)
Starting at $5.59
Mustard Seeds - Nemagonmid size pouch type seed packaging for - Mustard Nemagon
-0
Mustard Seeds - Nemagon
Starting at $4.29
Fennel Seeds - Sweetsmall size packet type seed packaging for - Fennel Sweet
-0
Heirloom
Fennel Seeds - Sweet
Starting at $2.99
Lettuce Seeds - Tangosmall size packet type seed packaging for - Lettuce Tango
-0
Heirloom
Lettuce Seeds - Tango
Starting at $2.99
Leek Seeds - Giant MusselburghLeek Seeds - Giant Musselburgh
-0
Heirloom
Leek Seeds - Giant Musselburgh
Starting at $2.99
Mustard Seeds - Summer Fest Komatsuna Hybridmid size pouch type seed packaging for - Mustard Summer Fest Komatsuna Hybrid
-0
Mustard Seeds - Summer Fest Komatsuna Hybrid
Starting at $3.99
Cress Seeds - Uplandmid size pouch type seed packaging for - Cress Upland
-0
Heirloom
Cress Seeds - Upland
Starting at $2.99
Lettuce Seeds - Crisphead - Hanson Improvedmid size pouch type seed packaging for - Lettuce Crisphead Hanson Improved
-0
Heirloom
Lettuce Seeds - Crisphead - Hanson Improved
Starting at $2.99
Dianthus Seeds - Floral Lace Series (Pelleted)Dianthus Seeds - Floral Lace Series (Pelleted)
-0
Dianthus Seeds - Floral Lace Series (Pelleted)
Starting at $4.89
Lettuce Seeds - Romaine / COS - Rouge D'Hiversmall size packet type seed packaging for - Lettuce Romaine / COS Rouge DHiver
-0
Heirloom
Lettuce Seeds - Romaine / COS - Rouge D'Hiver
Starting at $2.99
Spinach Seeds - Seaside - Hybrid
-0
Spinach Seeds - Seaside - Hybrid
Starting at $3.99
Broccoli Raab Seeds - Sorrentomid size pouch type seed packaging for - Broccoli Raab Sorrento
-0
Heirloom
Broccoli Raab Seeds - Sorrento
Starting at $3.39
Radish Seeds - Shirahime Hatsuka Daikonmid size pouch type seed packaging for - Radish Shirahime Hatsuka Daikon
-0
Heirloom
Radish Seeds - Shirahime Hatsuka Daikon
Starting at $3.99
Cauliflower Seeds - Song TJS-65 - Hybridmid size pouch type seed packaging for - Cauliflower Song TJS-65 Hybrid
-0
Cauliflower Seeds - Song TJS-65 - Hybrid
Starting at $3.99
Broccoli Seeds - Chinese Broccoli - Big Stemmid size pouch type seed packaging for - Broccoli Chinese Broccoli Big Stem
-0
Heirloom
Broccoli Seeds - Chinese Broccoli - Big Stem
Starting at $3.99
Lentil Seeds - Green - OrganicLentil Seeds - Green - Organic
-0
Heirloom
Organic
Lentil Seeds - Green - Organic
Starting at $4.98
Pansy Seeds - Halloween II
-0
Pansy Seeds - Halloween II
Starting at $5.79
Cauliflower Seeds - All Year Roundmid size pouch type seed packaging for - Cauliflower All Year Round
-0
Heirloom
Cauliflower Seeds - All Year Round
Starting at $3.29
Pea Seeds - Snap - Taichung 13mid size pouch type seed packaging for - Pea Snap Taichung 13
-0
Heirloom
Pea Seeds - Snap - Taichung 13
Starting at $3.99
Lettuce Seeds - Freckles (Organic)Lettuce Seeds - Freckles (Organic)
-0
Heirloom
Organic
Lettuce Seeds - Freckles (Organic)
Starting at $3.59
Seed Potatoes - Spring - Red Pontiac (Organic)
Starting at $19.33
Swiss Chard Seeds - Yellow
Starting at $2.99
Kale Seeds - Garden Blend
Starting at $2.99
Asparagus Crowns - Spring - Mary Washington
Starting at $7.47
Veronica Seeds - Blue Bouquet
Starting at $2.99
Parsley Seeds - Double Curled
Starting at $2.99
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