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May marks the shift into early summer conditions in the warm-winter zones, and gardens respond fast with rapid growth. Warm-season crops should be planted and growing strongly now, and succession sowing keeps harvests coming even as temperatures climb. Stay ahead of heat stress by mulching, watering consistently, and planting in the coolest part of the day — and in the hottest areas, begin planning for shade cloth and other summer protection.

Indoors (fresh harvests):

  • Microgreens: peas, broccoli, sunflowers, arugula
  • Sprouts: alfalfa, broccoli, radish, mung
  • Herbs & greens under lights: chives, parsley, mint

Transplants to move outdoors: Most warm-season crops should already be in the ground. If you have heat-tolerant starts on hand, get them out early in the month before conditions get too stressful.

Crops that can be directly sown outdoors in May: okra, sweet potato slips, cowpeas, yard-long beans, Malabar spinach, Armenian cucumber, and other heat-tolerant varieties. Standard cucumbers, squash, and beans can still go in early May in many areas.

Cover crops: cowpeas, sunn hemp, buckwheat, sorghum-sudangrass

Note: Cool-season crops are wrapping up. The focus shifts to heat-tolerant varieties and keeping the soil covered.

Tip: A Southern California zone 10 can be very different from a Florida zone 10. 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
202 Items
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Cauliflower Seeds - Snowball Y Improvedmid size pouch type seed packaging for - Cauliflower Snowball Y Improved
-0
Heirloom
Cauliflower Seeds - Snowball Y Improved
Starting at $2.99
Radish Seeds - Daikon Minowase
-0
Heirloom
Radish Seeds - Daikon Minowase
Starting at $3.99
Nasturtium Seeds - Jewel MixNasturtium Seeds - Jewel Mix
-0
Staff Favorite
Nasturtium Seeds - Jewel Mix
Starting at $2.99
Zinnia Seeds - California Giant MixZinnia Seeds - California Giant Mix
-0
Zinnia Seeds - California Giant Mix
Starting at $2.99
Tomato Seeds - Salad - Early Girl Hybridmid size pouch type seed packaging for - Tomato Salad Early Girl Hybrid
-0
Tomato Seeds - Salad - Early Girl Hybrid
Starting at $4.09
Basil Seeds - Genovesesmall size packet type seed packaging for - Basil Genovese
-33%
Heirloom
Basil Seeds - Genovese
Starting at $1.99
White Dutch Clover - Cover Crop Seedsmid size pouch type seed packaging for - White Dutch Clover Cover Crop
-0
Heirloom
White Dutch Clover - Cover Crop Seeds
Starting at $2.99
Mini Clover Lawn Seeds (Coated) - Miniature CloverMini Clover Lawn Seeds (Coated) - Miniature Clover
-0
Heirloom
Mini Clover Lawn Seeds (Coated) - Miniature Clover
Starting at $3.54
Basil Seeds - ThaiBasil Seeds - Thai
-50%
Heirloom
Staff Favorite
Basil Seeds - Thai
Starting at $1.99
Tomato Seeds - Cherry - Sunsugar HybridTomato Seeds - Cherry - Sunsugar Hybrid
-0
Tomato Seeds - Cherry - Sunsugar Hybrid
Starting at $4.69
Tomato Seeds - Cherry - Sweetiemid size pouch type seed packaging for - Tomato Cherry Sweetie
-0
Heirloom
Tomato Seeds - Cherry - Sweetie
Starting at $3.39
Alfalfa - Organic - Cover Crop Seedsmid size pouch type seed packaging for - Alfalfa Organic Cover Crop
-0
Heirloom
Organic
Alfalfa - Organic - Cover Crop Seeds
Starting at $9.44
French Marigold Seeds - Durango Series (Coated)French Marigold Seeds - Durango Series (Coated)
-0
French Marigold Seeds - Durango Series (Coated)
Starting at $3.89
Carrot Seeds - Purplesmall size packet type seed packaging for - Carrot Purple
-0
Heirloom
Carrot Seeds - Purple
Starting at $3.39
Basil Seeds - Lemonmid size pouch type seed packaging for - Basil Lemon
-0
Heirloom
Basil Seeds - Lemon
Starting at $2.99
Tomato Seeds - Cherry - Isis Candysmall size packet type seed packaging for - Tomato Cherry Isis Candy
-0
Heirloom
Tomato Seeds - Cherry - Isis Candy
Starting at $2.99
Broccoli Seeds - Green Sprouting Calabresesmall size packet type seed packaging for - Broccoli Green Sprouting Calabrese
-0
Heirloom
Broccoli Seeds - Green Sprouting Calabrese
Starting at $2.99
Broccoli Seeds - Di Cicco (Organic)small size packet type seed packaging for - Broccoli Di Cicco Organic
-0
Heirloom
Organic
Broccoli Seeds - Di Cicco (Organic)
Starting at $3.59
Melon Seeds - Cantaloupe - Imperial 45mid size pouch type seed packaging for - Melon Cantaloupe Imperial 45
-0
AAS Winner
Heirloom
Melon Seeds - Cantaloupe - Imperial 45
Starting at $3.09
French Marigold Seeds - Petite Mixturemid size pouch type seed packaging for - French Marigold Petite Mixture
-0
French Marigold Seeds - Petite Mixture
Starting at $2.99
Radish Seeds - WatermelonRadish Seeds - Watermelon
-0
Heirloom
Radish Seeds - Watermelon
Starting at $3.99
Zinnia Seeds - Lilliput MixtureZinnia Seeds - Lilliput Mixture
-0
Zinnia Seeds - Lilliput Mixture
Starting at $2.99
Kale Seeds - Premiermid size pouch type seed packaging for - Kale Premier
-33%
Heirloom
Kale Seeds - Premier
Starting at $1.99
Tomato Seeds - Cherry - Gold Nuggetmid size pouch type seed packaging for - Tomato Cherry Gold Nugget
-0
Heirloom
Tomato Seeds - Cherry - Gold Nugget
Starting at $3.29
Cosmos Seeds - Sensation Mixturesmall size packet type seed packaging for - Cosmos Sensation Mixture
-0
AAS Winner
Cosmos Seeds - Sensation Mixture
Starting at $2.99
Tomato Seeds - Slicing - Bush Early Girl HybridTomato Seeds - Slicing - Bush Early Girl Hybrid
-0
Tomato Seeds - Slicing - Bush Early Girl Hybrid
Starting at $4.49
Melon Seeds - Cantaloupe - Minnesota Midgetmid size pouch type seed packaging for - Melon Cantaloupe Minnesota Midget
-0
Heirloom
Melon Seeds - Cantaloupe - Minnesota Midget
Starting at $2.99
Zinnia Seeds - Profusion Series (Coated)Zinnia Seeds - Profusion Series (Coated)
-0
AAS Winner
Zinnia Seeds - Profusion Series (Coated)
Starting at $3.59
Swiss Chard Seeds - Rainbow Mixture
Starting at $3.89
French Marigold Seeds - Sparky Mixture
Starting at $2.99
Swiss Chard Seeds - Rainbow Mixture (Organic)
Starting at $3.69
Zinnia Seeds - Dahlia Flowered Mixture
Starting at $2.99
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