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
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Greenhouse Cloche
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Greenhouse Cloche
$62.11
Lettuce Seeds - Leaf - Lollo Rosso (Organic) - Clearance Seedsmid size pouch type seed packaging for - Lettuce Leaf Lollo Rosso Organic Clearance
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Coco Fiber Plant Pots - Square / Spanish StyleCoco Fiber Plant Pots - Square / Spanish Style
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Growing Kit - 5 Inch Pots - Seed Starts and Indoor ContainersGrowing Kit - 5 Inch Pots - Seed Starts and Indoor Containers
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$23.84
Anemone Bulbs - Carmel Bordeaux
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Starting at $29.99
Endive Seeds - Catalogna Garnet Stemsmall size packet type seed packaging for - Endive Catalogna Garnet Stem
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Heirloom
Endive Seeds - Catalogna Garnet Stem
Starting at $2.99
Endive Seeds - Pancaliere
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Endive Seeds - Pancaliere
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Allium Bulbs - Mount Everest
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Allium Bulbs - Mount Everest
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Reflective Bird Scare Tape
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$11.95
Squash Seeds - Winter - Burgess Buttercup Bush (Organic)
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Starting at $3.79
Grafting/Budding Folding Knife - Garden Hand ToolsGrafting/Budding Folding Knife - Garden Hand Tools
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$13.95
Pepper Seeds - Hot - Jamaican Red
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Heirloom
Pepper Seeds - Hot - Jamaican Red
Starting at $3.09
Peony Bulbs - Sarah BernhardtPeony Bulbs - Sarah Bernhardt
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Peony Bulbs - Sarah Bernhardt
Starting at $17.99
Bean Seeds - Bush - Dark Red Kidney
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Bean Seeds - Bush - Dark Red Kidney
Starting at $2.79
Tomato Seeds - Salad - Variegated
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Starting at $3.69
Pink Oyster ‘Spray & Grow’ Mushroom Growing KitPink Oyster ‘Spray & Grow’ Mushroom Growing Kit
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Bag packaging for Bud Charge by Mighty Plant, contact customer service at 801-491-8700 for instructions helpBack bag packaging for Bud Charge by Mighty Plant, contact customer service at 801-491-8700 for instructions help
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BUDCHARGE™ by Mighty Plant
$18.00
Tomato Seeds - Slicing - Early Choice Black F1mid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Tomato Seeds - Slicing - Early Choice Black F1
Starting at $4.39
Tomato Seeds - Red Plumsmall size packet type seed packaging for - Tomato Red Plum
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Tomato Seeds - Red Plum
Starting at $2.99
Bearded Iris Bulbs -  Light Blue
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Corn Seeds - Sweet - Nirvana F1 HybridCorn Seeds - Sweet - Nirvana F1 Hybrid
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Starting at $5.09
Bearded Iris Bulbs -  Yellow
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Tomato Seeds - Salad - Husky Goldmid size pouch type seed packaging for - Zinnia Magellan Series Orange
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Starting at $3.69
Anemone Bulbs - Galilee Pastel Mix
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Starting at $29.99
Daffodil Bulbs - Large Cupped 'Fortune'
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Daffodil Bulbs - Large Cupped 'Fortune'
Starting at $19.99
Radish Seeds - Red Rat's Tail
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Radish Seeds - Red Rat's Tail
Starting at $2.79
Corn Seeds - Ornamental - Wampumsmall size packet type seed packaging for - Corn Ornamental Wampum
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Corn Seeds - Ornamental - Wampum
Starting at $4.39
Dahlia Bulbs - Cafe Au Lait
$22.99
Dahlia Bulbs - Emory Paul
$11.50 $22.99
Boysenberry Roots
$18.99
Pepper Seeds - Hot - Habanero Caribbean Red - Clearance...
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The Ugly Vegetables - Book & Seed Assortment
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