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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
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Tomato Seeds - Slicing - Old Germanmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Heirloom
Tomato Seeds - Slicing - Old German
Starting at $4.79
Squash Seeds - Vermicelli F1small size packet type seed packaging for - Squash Vermicelli F1
-0
Squash Seeds - Vermicelli F1
Starting at $3.99
Celery Seeds - Red Stalk (Organic)small size packet type seed packaging for - Celery Red Stalk Organic
-0
Heirloom
Organic
Celery Seeds - Red Stalk (Organic)
Starting at $5.09
Corn Seeds - Dent - Boone County Whitesmall size packet type seed packaging for - Corn Dent Boone County White
-0
Heirloom
Corn Seeds - Dent - Boone County White
Starting at $2.63
Corn Seeds - Popcorn - Rainbow Jewel
-0
Corn Seeds - Popcorn - Rainbow Jewel
Starting at $3.99
Pak Choi TaisaiPak Choi Taisai
-0
Heirloom
Pak Choi Seeds - Taisai
Starting at $3.99
Mustard Seeds - Mizuna - Lime Streaks
-0
Heirloom
Mustard Seeds - Mizuna - Lime Streaks
Starting at $3.99
Bean Seeds - Bush - Kentucky Wonder
-0
Heirloom
Bean Seeds - Bush - Kentucky Wonder
Starting at $2.63
Cucumber Seeds - Pioneer Hybridsmall size packet type seed packaging for - Cucumber Pioneer Hybrid
-0
Cucumber Seeds - Pioneer Hybrid
Starting at $3.99
Lettuce Seeds - Butterhead - Carmona Redsmall size packet type seed packaging for - Lettuce Butterhead Carmona Red
-0
Heirloom
Lettuce Seeds - Butterhead - Carmona Red
Starting at $2.99
Bean Seeds - Pole - Dark Green Yard Longmid size pouch type seed packaging for - Bean Pole Dark Green Yard Long
-0
Heirloom
Bean Seeds - Pole - Dark Green Yard Long
Starting at $3.99
Bean Seeds - Bush - Provider (Treated)small size packet type seed packaging for - Bean Bush Provider Treated
-0
Heirloom
Bean Seeds - Bush - Provider (Treated)
Starting at $11.06
Swiss Chard Seeds - Barese Dark Green Smooth Leafmid size pouch type seed packaging for - Swiss Chard Barese Dark Green Smooth Leaf
-0
Heirloom
Swiss Chard Seeds - Barese Dark Green Smooth Leaf
Starting at $2.99
Onion Seeds - Bunching - Heshiko (Treated)Onion Seeds - Bunching - Heshiko (Treated)
-0
Heirloom
Onion Seeds - Bunching - Heshiko (Treated)
Starting at $3.99
Tomato Seeds - Salad - Sub Arctic Plentysmall size packet type seed packaging for - Tomato Salad Sub Arctic Plenty
-0
Heirloom
Tomato Seeds - Salad - Sub Arctic Plenty
Starting at $2.99
Bean Seeds - Bush - Black Valentinesmall size packet type seed packaging for - Bean Bush Black Valentine
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Heirloom
Bean Seeds - Bush - Black Valentine
Starting at $2.63
Tomato Seeds - Salad - Czech Bushmid size pouch type seed packaging for - Tomato Salad Czech Bush
-0
Tomato Seeds - Salad - Czech Bush
Starting at $2.99
Onion Seeds - Bunching - Heshikomid size pouch type seed packaging for - Onion Bunching Heshiko
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Heirloom
Onion Seeds - Bunching - Heshiko
Starting at $3.99
Lettuce Rouge dHiver OrganicLettuce Rouge dHiver Organic
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Heirloom
Organic
Lettuce Seeds - Rouge d Hiver - Organic
Starting at $3.59
Lettuce Seeds - Batavian - Nevadasmall size packet type seed packaging for - Lettuce Batavian Nevada
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Lettuce Seeds - Batavian - Nevada
Starting at $2.99
Tomato Seeds - Slicing - Bush Champion II HybridTomato Seeds - Slicing - Bush Champion II Hybrid
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Tomato Seeds - Slicing - Bush Champion II Hybrid
Starting at $5.89
Pea Seeds - Snap - Purple Magnoliamid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Pea Seeds - Snap - Purple Magnolia
Starting at $2.99
Okra Seeds - BlondyOkra Seeds - Blondy
-0
AAS Winner
Heirloom
Okra Seeds - Blondy
Starting at $2.99
Melon Seeds - Cantaloupe - Golden Delicious
-0
Heirloom
Melon Seeds - Cantaloupe - Golden Delicious
Starting at $2.99
Endive Seeds - Gourmet Mix
Starting at $2.99
Gourd Seeds - Nam Tao Klom - Hybrid
Starting at $3.99
Squash Seeds - Table King Bush Acorn (Organic)
Starting at $3.59
Cucumber Seeds - Metki Dark Green Armenian
Starting at $2.99
Watermelon Seeds - Icebox - Bush Jubilee
Starting at $3.59
Squash Seeds - Korean, Summer - Early Bulam - Hybrid...
Starting at $3.99
Corn Seeds - Popcorn - Neon Pink
Starting at $3.89
Pepper Seeds - Hot - Cayenne Orange
Starting at $2.99
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