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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
4042 Items
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Pepper Seeds - Sweet - Sunset Italian Mix (Organic)small size packet type seed packaging for - Pepper Sweet Sunset Italian Mix Organic
-0
Heirloom
Organic
Pepper Seeds - Sweet - Sunset Italian Mix (Organic)
Starting at $4.19
Petunia Seeds - Daddy Series (Pelleted)Petunia Seeds - Daddy Series (Pelleted)
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Petunia Seeds - Daddy Series (Pelleted)
Starting at $3.09
Cabbage Seeds - Red Acre (Organic)mid size pouch type seed packaging for - Cabbage Red Acre Organic
-0
Heirloom
Organic
Cabbage Seeds - Red Acre (Organic)
Starting at $3.69
Winter Rye - Organic - Cover Crop SeedsWinter Rye - Organic - Cover Crop Seeds
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Winter Rye - Organic - Cover Crop Seeds
Starting at $3.49
Carrot Seeds - Imperator 58mid size pouch type seed packaging for - Carrot Imperator 58
-0
AAS Winner
Heirloom
Carrot Seeds - Imperator 58
Starting at $2.99
Tomato Seeds - Cherry - Sweetiemid size pouch type seed packaging for - Tomato Cherry Sweetie
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Heirloom
Tomato Seeds - Cherry - Sweetie
Starting at $3.39
Cucumber Seeds - Marketmore 76 (Organic)small size packet type seed packaging for - Cucumber Marketmore 76 Organic
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Heirloom
Organic
Cucumber Seeds - Marketmore 76 (Organic)
Starting at $3.59
Hyssop Seedsmid size pouch type seed packaging for - Hyssop
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Heirloom
Hyssop Seeds
Starting at $2.99
Onion - Sprouting SeedsOnion - Sprouting Seeds
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Onion - Sprouting Seeds
Starting at $20.54
Basil Seeds - Siam Queen
-50%
AAS Winner
Heirloom
Basil Seeds - Siam Queen
Starting at $1.99
Pepper Seeds - Sweet - Pepperoncini Italiansmall size packet type seed packaging for - Pepper Sweet Pepperoncini Italian
-44%
Heirloom
Pepper Seeds - Sweet - Pepperoncini Italian
Starting at $1.99
Oats - Whole (Organic) - Grass SeedsOats - Whole (Organic) - Grass Seeds
-0
Organic
Oats - Whole (Organic) - Grass Seeds
Starting at $7.20
Okra Seeds - Clemson Spineless (Organic)small size packet type seed packaging for - Okra Clemson Spineless Organic
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Heirloom
Organic
Okra Seeds - Clemson Spineless (Organic)
Starting at $3.59
Cauliflower - Snowball Y Improved - Microgreens SeedsCauliflower - Snowball Y Improved - Microgreens Seeds
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Heirloom
Cauliflower - Snowball Y Improved - Microgreens Seeds
Starting at $6.77
Alfalfa - Cover Crop Seedsmid size pouch type seed packaging for - Alfalfa Cover Crop
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Alfalfa - Cover Crop Seeds
Starting at $2.99
Radish Seeds - Cover Crop - Daikon Minowase (Organic)Radish Seeds - Cover Crop - Daikon Minowase (Organic)
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Organic
Radish Seeds - Cover Crop - Daikon Minowase (Organic)
Starting at $7.85
Cabbage Seeds - Red Acre (Organic) - Microgreens Seedsmid size pouch type seed packaging for - Cabbage Red Acre Organic Microgreens
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Heirloom
Organic
Staff Favorite
Cabbage Seeds - Red Acre (Organic) - Microgreens Seeds
Starting at $9.35
Corn Seeds - Sweet - (su) Early Sunglow F1 Hybridmid size pouch type seed packaging for - Corn Sweet su Early Sunglow Hybrid
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Corn Seeds - Sweet - (su) Early Sunglow F1 Hybrid
Starting at $4.89
Tomato Seeds - Slicing - Red Ponderosa Beefsteak (Organic)small size packet type seed packaging for - Tomato Slicing Red Ponderosa Beefsteak Organic
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Heirloom
Organic
Tomato Seeds - Slicing - Red Ponderosa Beefsteak (Organic)
Starting at $3.79
Zinnia Seeds - Pumila Pompon
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Heirloom
Zinnia Seeds - Pumila Pompon
Starting at $3.39
Hydroponic Microgreens Starter KitHydroponic Microgreens Starter Kit
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Hydroponic Microgreens Starter Kit
$81.44
Kohlrabi Seeds - Early White ViennaKohlrabi Seeds - Early White Vienna
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Kohlrabi Seeds - Early White Vienna
Starting at $2.99
Pepper Seeds - Sweet - Keystone Resistant Giantmid size pouch type seed packaging for - Pepper Sweet Keystone Resistant Giant
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Heirloom
Pepper Seeds - Sweet - Keystone Resistant Giant
Starting at $2.99
Clover - Red (Organic) - Microgreens SeedsClover - Red (Organic) - Microgreens Seeds
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Organic
Clover - Red (Organic) - Microgreens Seeds
Starting at $3.76
Basil - Dark Opal - Microgreens SeedsBasil - Dark Opal - Microgreens Seeds
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Heirloom
Basil - Dark Opal - Microgreens Seeds
Starting at $13.02
Arugula Seeds - Astro - Microgreens SeedsArugula Seeds - Astro - Microgreens Seeds
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Heirloom
Arugula Seeds - Astro - Microgreens Seeds
Starting at $5.60
Soybean - Yellow (Organic) - Sprouting Seedssmall size packet type seed packaging for - Soybean Yellow Organic Sprouting
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Organic
Soybean - Yellow (Organic) - Sprouting Seeds
Starting at $3.59
Alfalfa - Organic - Cover Crop Seedsmid size pouch type seed packaging for - Alfalfa Organic Cover Crop
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Heirloom
Organic
Alfalfa - Organic - Cover Crop Seeds
Starting at $9.44
Bloom Master Hanging BasketsBloom Master Hanging Baskets
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Bloom Master Hanging Baskets
Starting at $11.78
Onion Seeds - Short - Texas 1015 Super Sweet
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Onion Seeds - Short - Texas 1015 Super Sweet
Starting at $2.99
Organic Herb Collection 8 PackOrganic Herb Collection 8 Pack
-0
Heirloom
Organic
Organic Herb Collection - 8 Pack
$12.75
Onion Red Burgundymid size pouch type seed packaging for - Onion Short Red Burgundy
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Onion Seeds - Short - Red Burgundy
Starting at $2.99
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