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
697 Items
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Corn Seeds - Flour - Montana Morado Maize
-0
Corn Seeds - Flour - Montana Morado Maize
Starting at $4.49
Onion Seeds - Utah Yellow Sweet Spanish (Organic)mid size pouch type seed packaging for - Onion Utah Yellow Sweet Spanish Organic
-0
Heirloom
Organic
Onion Seeds - Utah Yellow Sweet Spanish (Organic)
Starting at $3.69
Sprouting Seed Assortment - 12 Pack - PremeasuredSprouting Seed Assortment - 12 Pack - Premeasured
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Organic
Staff Favorite
Sprouting Seed Assortment - 12 Pack - Premeasured
$15.71
Wildflower Seeds - Midwest MixWildflower Seeds - Midwest Mix
-0
Wildflower Seeds - Midwest Mix
Starting at $4.19
Bean Seeds - Pole - Great Northern Cannellini (Organic)mid size pouch type seed packaging for - Bean Pole Great Northern Cannellini Organic
-0
Heirloom
Organic
Bean Seeds - Pole - Great Northern Cannellini (Organic)
Starting at $3.59
Brassica Classic Trio Cover Crop Seed MixBrassica Classic Trio Cover Crop Seed Mix
-0
Brassica Classic Trio Cover Crop Seed Mix
Starting at $6.36
Herb Seed Assortment - Perennial HerbHerb Seed Assortment - Perennial Herb
-0
Heirloom
Herb Seed Assortment - Perennial Herb
$20.73
Bean Seeds - Pole - Purple French Filetmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Heirloom
Bean Seeds - Pole - Purple French Filet
Starting at $4.92
Parsley Seeds - Forest Greenmid size pouch type seed packaging for - Parsley Forest Green
-0
Heirloom
Parsley Seeds - Forest Green
Starting at $2.99
Premium Durable Self-Watering Microgreens Growing TraysPremium Durable Self-Watering Microgreens Growing Trays
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Premium Durable Self-Watering Microgreens Growing Trays
Starting at $16.30
Max Water RetentionMinute Soil+ - Max Water Retention Mix
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Minute Soil+ - Max Water Retention Mix
Starting at $22.19
Pump Pressure Water Sprayer BottlePump Pressure Water Sprayer Bottle
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Staff Favorite
Pump Pressure Water Sprayer Bottle
$21.95
Basil Seeds - Corsican
-0
Heirloom
Basil Seeds - Corsican
Starting at $2.49
Cosmos Seeds - Sensation Mix (Organic) - Clearance Seeds
-41%
Organic
Cosmos Seeds - Sensation Mix (Organic) - Clearance Seeds
Starting at $4.20
Culinary Basil Collection 5 Seeds & Book Basil Seeds Collection - 5 Varieties
-0
Heirloom
Basil Seeds Collection - 5 Varieties
$15.80
Bean Seeds - Bush - Landreth Stringlessmid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Heirloom
Bean Seeds - Bush - Landreth Stringless
Starting at $2.99
Cauliflower Seeds - Purple of Sicilymid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Cauliflower Seeds - Purple of Sicily
Starting at $3.89
Nursery Plastic Plant Labels - Seed StartingNursery Plastic Plant Labels - Seed Starting
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Nursery Plastic Plant Labels - Seed Starting
$9.04
Basil Seeds - Clove Scentedsmall size packet type seed packaging for - Basil Clove Scented
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Heirloom
Basil Seeds - Clove Scented
Starting at $2.99
Strawberry Roots - Everbearing - Albion Hybrid
$24.95
Wildflower Seed Shaker - Bee Friendly Mix
$14.62
Coco Fiber Plant Pots - Large Round
Starting at $7.95
Ageratum Seeds - Dwarf Blue Mink
Starting at $2.99
Nasturtium Microgreens (Organic)
Starting at $15.75
Asparagus Crowns - Spring - Jersey Giant
Starting at $7.48
Seed Potatoes - French Fingerling (Organic)
Starting at $12.54
Wildflower Seed Shaker - Save the Monarchs
$11.02
French Marigold Seeds - Bolero
Starting at $2.99
Basil Seeds - Dwarf Greek (Organic)
Starting at $3.99
Zinnia Seeds - Cactus Flowered Mix
Starting at $3.39
Strawberry Roots - June Bearing - Honeoye Hybrid
$12.48 $24.95
Shallot Sets - Yellow
$7.33 $14.65
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