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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
88 Items
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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
Basil Seeds - ThaiBasil Seeds - Thai
-50%
Heirloom
Staff Favorite
Basil Seeds - Thai
Starting at $1.99
Cress Seeds - Watercressmid size pouch type seed packaging for - Cress Watercress
-0
Heirloom
Cress Seeds - Watercress
Starting at $3.39
Basil Seeds - Lemonmid size pouch type seed packaging for - Basil Lemon
-0
Heirloom
Basil Seeds - Lemon
Starting at $2.99
Nasturtium Seeds - Alaskamid size pouch type seed packaging for - Nasturtium Alaska
-0
Nasturtium Seeds - Alaska
Starting at $2.99
Molokhia - Egyptian Spinach Seedsmid size pouch type seed packaging for - Molokhia Egyptian Spinach
-0
Heirloom
Molokhia - Egyptian Spinach Seeds
Starting at $3.99
Radish Seeds - WatermelonRadish Seeds - Watermelon
-0
Heirloom
Radish Seeds - Watermelon
Starting at $3.99
Shiso Herb Seeds (Perilla) - GreenShiso Herb Seeds (Perilla) - Green
-0
Heirloom
Shiso Herb Seeds (Perilla) - Green
Starting at $3.99
Shiso Seeds (Perilla) - Green Ohbamid size pouch type seed packaging for - Shiso Perilla Green Ohba
-0
Heirloom
Shiso Seeds (Perilla) - Green Ohba
Starting at $3.99
Malabar Spinach Seeds - Big Round Leaf
-0
Heirloom
Malabar Spinach Seeds - Big Round Leaf
Starting at $3.99
Spinach Seeds - Green Vines Supreme Malabarmid size pouch type seed packaging for - Spinach Green Vines Supreme Malabar
-0
Heirloom
Spinach Seeds - Green Vines Supreme Malabar
Starting at $3.99
Tomato Seeds - Cherry - Suncherry Extra Sweet Hybridmid size pouch type seed packaging for - Tomato Cherry Suncherry Extra Sweet Hybrid
-0
Tomato Seeds - Cherry - Suncherry Extra Sweet Hybrid
Starting at $3.99
Radish Seeds - Korean - Cheong Du - Hybridmid size pouch type seed packaging for - Radish Korean Cheong Du Hybrid
-30%
Radish Seeds - Korean - Cheong Du - Hybrid
Starting at $2.79
Broccoli Seeds - Chinese Broccoli - Kailaanmid size pouch type seed packaging for - Broccoli Chinese Broccoli Kailaan
-0
Heirloom
Broccoli Seeds - Chinese Broccoli - Kailaan
Starting at $3.99
Nasturtium Seeds - Empress of Indiamid size pouch type seed packaging for - Nasturtium Empress of India
-0
Nasturtium Seeds - Empress of India
Starting at $2.99
Amaranth Seeds - Green Leaf - Lu Hsienmid size pouch type seed packaging for - Amaranth Green Leaf Lu Hsien
-0
Heirloom
Amaranth Seeds - Green Leaf - Lu Hsien
Starting at $3.99
Pepper Seeds - Sweet - Shishito (Organic)Pepper Seeds - Sweet - Shishito (Organic)
-0
Heirloom
Organic
Pepper Seeds - Sweet - Shishito (Organic)
Starting at $3.99
Spinach Seeds - Lakeside - Hybrid
-0
Spinach Seeds - Lakeside - Hybrid
Starting at $3.99
Radish Korean Bora King Hybrid mid size pouch type seed packaging for - Radish Korean Bora King Hybrid
-0
Radish Seeds - Korean - Bora King - Hybrid
Starting at $3.99
Okra Seeds - Star Of Davidmid size pouch type seed packaging for - Zinnia Magellan Series Orange
-0
Heirloom
Okra Seeds - Star Of David
Starting at $2.99
Gourd Seeds, Bitter - White - Hybridmid size pouch type seed packaging for - Gourd Bitter White Hybrid
-0
Gourd Seeds, Bitter - White - Hybrid
Starting at $3.99
Parsley Seeds - Japanese Mitsubamid size pouch type seed packaging for - Parsley Japanese Mitsuba
-0
Heirloom
Parsley Seeds - Japanese Mitsuba
Starting at $3.99
Tomato Seeds - Slicing - Momotaro Hybridmid size pouch type seed packaging for - Tomato Slicing Momotaro Hybrid
-0
Tomato Seeds - Slicing - Momotaro Hybrid
Starting at $4.99
Amaranth Seeds - Red Leaf - Hu Hsienmid size pouch type seed packaging for - Amaranth Red Leaf Hu Hsien
-0
Heirloom
Amaranth Seeds - Red Leaf - Hu Hsien
Starting at $3.99
Gourd Seeds, Bitter - Joy Green - Hybridmid size pouch type seed packaging for - Gourd Bitter Joy Green Hybrid
-0
Gourd Seeds, Bitter - Joy Green - Hybrid
Starting at $3.99
Broccoli Seeds - Chinese Broccoli - Late Jade - Hybridmid size pouch type seed packaging for - Broccoli Chinese Broccoli Late Jade Hybrid
-0
Broccoli Seeds - Chinese Broccoli - Late Jade - Hybrid
Starting at $3.99
Celery Seeds - Nan Ling Cutting
-0
Heirloom
Celery Seeds - Nan Ling Cutting
Starting at $3.99
Catmint Seeds - Blue Moonmid size pouch type seed packaging for - Catmint Blue Moon
-0
Catmint Seeds - Blue Moon
Starting at $3.69
Melon Seeds - Korean - Dae Jang Geum Hybridmid size pouch type seed packaging for - Melon Korean Dae Jang Geum Hybrid
-0
Melon Seeds - Korean - Dae Jang Geum Hybrid
Starting at $3.99
Gourd Seeds - Bitter Green - Hybridmid size pouch type seed packaging for - Gourd Bitter Green Hybrid
-0
Gourd Seeds - Bitter Green - Hybrid
Starting at $3.99
Gourd Seeds, Bitter - Futo - Spindle
Starting at $3.99
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