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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
136 Items
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Chinese Toon Seeds - North Redmid size pouch type seed packaging for - Chinese Toon North Red
-0
Heirloom
Chinese Toon Seeds - North Red
Starting at $3.99
Achillea Seeds - Summer Pastels Mixmid size pouch type seed packaging for - Achillea Summer Pastels Mix
-6%
AAS Winner
Achillea Seeds - Summer Pastels Mix
Starting at $3.99
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
Pampas Grass SeedsPampas Grass Seeds
-0
Pampas Grass Seeds
Starting at $2.99
Asparagus Seeds - UC 157 F1small size packet type seed packaging for - Asparagus UC 157 F1
-0
Asparagus Seeds - UC 157 F1
Starting at $4.69
Myosotis (Forget-Me-Not) Seeds - Sylvaticamid size pouch type seed packaging for - Myosotis Forget-Me-Not Sylvatica
-0
Myosotis (Forget-Me-Not) Seeds - Sylvatica
Starting at $2.99
Columbine Seeds - Dragonfly Mixmid size pouch type seed packaging for - Columbine Dragonfly Mix
-0
Columbine Seeds - Dragonfly Mix
Starting at $3.59
Russian Sage Perovskia Seeds - Blue Steelmid size pouch type seed packaging for - Russian Sage Perovskia Blue Steel
-0
Russian Sage Perovskia Seeds - Blue Steel
$20.96
Evening Primrose Seeds - Dwarfmid size pouch type seed packaging for - Evening Primrose Dwarf
-0
Evening Primrose Seeds - Dwarf
Starting at $2.99
Onion Seeds - Bunching - Shimonita Negimid size pouch type seed packaging for - Onion Bunching Shimonita Negi
-0
Heirloom
Onion Seeds - Bunching - Shimonita Negi
Starting at $3.99
Linum Seeds - Blue Flaxsmall size packet type seed packaging for - Linum Blue Flax
-0
Linum Seeds - Blue Flax
Starting at $2.79
Columbine Seeds - Origami Mixmid size pouch type seed packaging for - Columbine Origami Mix
-0
Columbine Seeds - Origami Mix
Starting at $4.39
Oenothera Seeds - Showy Evening Primrosemid size pouch type seed packaging for - Oenothera Showy Evening Primrose
-0
Oenothera Seeds - Showy Evening Primrose
Starting at $2.99
Columbine Seeds - McKana Giant AASmid size pouch type seed packaging for - Columbine McKana Giant AAS
-0
AAS Winner
Columbine Seeds - McKana Giant AAS
Starting at $3.39
Mimosa Seeds - Sensitive PlantMimosa Seeds - Sensitive Plant
-0
Mimosa Seeds - Sensitive Plant
Starting at $2.99
Ratibida Seeds - Mexican Hatsmall size packet type seed packaging for - Ratibida Mexican Hat
-0
Ratibida Seeds - Mexican Hat
Starting at $2.99
Myosotis Compindi (Forget-Me-Not) Seedsmid size pouch type seed packaging for - Myosotis Compindi Forget-Me-Not
-0
Myosotis Compindi (Forget-Me-Not) Seeds
Starting at $3.39
Onion Seeds - Short - Eclipse L303small size packet type seed packaging for - Onion Short Eclipse L303
-0
Heirloom
Onion Seeds - Short - Eclipse L303
Starting at $2.99
Asparagus Crowns - Spring - Mary Washington
Starting at $7.47
Salvia Seeds - Blue Queen
Starting at $3.74
Sweet Pea Seeds - Everlasting
Starting at $2.99
Saponaria Seeds - Rock Soapwort
Starting at $3.29
Hollyhock Seeds - Powderpuffs Double Mix
Starting at $2.99
Hollyhock Seeds - Chaters Double Mixture
Starting at $3.39
Competition Pumpkin Seeds - 400 lb plus
$9.97
Pyrethrum (Painted Daisy) Seeds - Robinsons Mixture
Starting at $2.99
Hollyhock Seeds - Nigra
Starting at $2.99
Coffee Seeds - Coffea Arabica Nana
Starting at $4.39
Rhubarb Crowns - Spring - Canadian Red
Starting at $15.86
Shasta Daisy Seeds - Crazy Daisy
Starting at $3.09
Asparagus Crowns - Sweet Purple
Starting at $7.48
Rhubarb Crowns - Spring - Valentine
Starting at $15.86
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