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.
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Kale Seeds - Red Russian (Organic)
50 days. Brassica napus var. pabularia. Organic Red Russian Kale Seeds. Non-GMO, annual, organic, heirloom, open-pollinated. This is suitable for containers, garden plots, raised beds, and fields. Classic “Ragged Jack/Buda”...
Spinach Seeds - Green Vines Supreme Malabar
60 days. Basella alba. Green Vines Supreme Malabar Spinach Seeds. Non-GMO, warm-season annual/perennial, heirloom, open-pollinated. This crop is suitable for trellised garden plots, raised beds, and large containers. This spinach...
Tobacco Seeds - Cigar Collection
The Cigar Seed Collection boasts a diverse assortment of three of the most popular tobacco varieties native to both the Caribbean and the famous Connecticut River Valley. Cuban Criollo 98...
Mustard - Mizuna - Microgreens Seeds
Up to 12 days. Mizuna is a fast, easy grower that makes a great choice as a secondary green in any salad. It has a very mild mustard / spice...
Dill Seeds - Mammoth (Organic)
55-75 Days to maturity. Anethum graveolens. Organic Mammoth Dill Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, and raised beds. Mammoth Dill offers garden-fresh,...
Artichoke Seeds - Imperial Star
150-160 days from sowing. Cynara scolymus. Imperial Star Artichoke Seeds. Non-GMO, perennial. This is suitable for garden plots, raised beds, and fields. UC-bred, nearly spineless plants for first-year harvests—uniform, high-yielding...
Asparagus Seeds - UC 157 F2
3 years to first harvest, annual harvest. Non-GMO, Hybrid. Perennial. This variety was developed at the University of California, Riverside in 1978 by Frank Southers and Frank Takatori. This hybrid...
Broccoli Seeds - Destiny Hybrid
70 to 75 days. Annual. Non-GMO Hybrid seeds. The Destiny Hybrid is a popular variety of the broccoli garden crop to grow. Destiny Hybrid seeds are more tolerant to heat...
Pepper Seeds - Hot - Thai Hot
80-89 Days to maturity (from transplant). Capsicum annuum. Thai Hot Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, deer resistant, high-yielding, hot pepper with hot heat levels. 50,000 to 100,000 Scoville Heat...
Broccoli Seeds - Di Cicco
Brassica oleracea (50-70 days) Di Cicco is an Italian heirloom broccoli dating from 1890. Di Cicco broccoli is very vigorous, emerald green, producing nice central heads 3-5" wide. Approx. 9,000...
Coleus Seeds - Wizard Series (Pelleted)
84-91 Days to maturity. Plectranthus scutellarioides’Wizard Series’. Coleus Wizard Series Seeds. Non-GMO, Annual. Wizard Series coleus seeds are a simple, compact, yet spectacular Asian showstopper perfect for many diverse gardens...
Cauliflower Seeds - Cheddar Hybrid
70-75 days. This beautiful orange cauliflower boasts uniform, smooth, firm heads. Leave heads untied for maximum color intensity. Roasting enhances the flavor of cheddar cauliflower. In warm growing areas, plant...
Buckwheat Groats (Organic) - Sprouting Seeds
1-3 Days to Harvest. Fagopyrum esculentum. Organic Buckwheat Groats Sprouting Seeds. Organic. Non-GMO. Sprouting. Excellent Germination Rate. Organic buckwheat groats (hulled, shell removed) can be a somewhat challenging grain to...
Bean Seeds - Bush - California Black-Eye Cowpeas
75 Days to maturity. Vigna unguiculata. California Black-Eyed Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, bush, shelling bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses. Cowpeas, or...
Beet - Rainbow Blend - Microgreen Seeds
12 to 23 Days to Harvest. Beta vulgaris. Rainbow Blend Beet Microgreen Seeds. Non-GMO, open-pollinated, heirloom. This colorful blend combines multiple beet varieties to produce a tray of microgreens with...
Pepper Seeds - Sweet - Gypsy Hybrid
62 Days to maturity (from transplant). Capsicum annuum. Gypsy Hybrid Pepper Seeds. Non-GMO, annual, hybrid, AAS Winner, sweet-type, with no heat levels. 0 Scoville Heat Units. Suitable for growing in...
Squash Seeds - Winter - Blue Hubbard
Blue Hubbard Squash is a blue-gray-green slightly ridged and warted winter squash variety. it's best attributes is its long storage time (6 months!) and its perfectly sweet taste. Don't let...
Mustard Seeds - Red Giant (Organic)
48 days. Non-GMO, Heirloom Organic Red Giant Mustard Herb Garden Seed from True Leaf Market. Brassica juncea. In general, mustard is an ideal garden plant to grow near herbs. As...
Lettuce Seeds - Jericho
(26 days for baby greens, 56 days for full size) Jericho Lettuce Seeds. Silky smooth neon green romaine leaves reach for the sky in this amazing lettuce with origins in...
Cauliflower Seeds - Self-Blanche
52 days. Large, close-jacket leaves make blanching easy. Deep, smooth, fine-grained heads. This is great for freezing and pickling; a low-calorie, nutritious snack that can be refrigerated and eaten raw...
Mustard Seeds - Tatsoi
50 days. Non-GMO, Heirloom Tatsoi Mustard Herb Garden Seed from True Leaf Market. Brassica rapa subsp. narinosa. Tatsoi Mustard or "Spoon Mustard" comes from China and gained tradition as a...
Bean Seeds - Bush - Aquadulce Fava
70-85 Days to maturity. Vicia faba. Organic Fava Bean Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, bush, shell, fava bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Purslane Seeds - Golden
35 days. Purslane Golden is one terrific green! Super healthy, it is loaded with Omega 3- more than any other leafy vegetable, more than many fish oil, and has a...
Turnip Seeds - White Egg
Brassica rapa (45-55 days) AKA "Early White Egg" or "Snowball". White egg turnip is a long time favorite in the South where it is know for its reliability and fine...
Kohlrabi Seeds - Purple Vienna (Organic)
50-55 days. Brassica oleracea var. gongylodes. Organic Purple Vienna Kohlrabi Seeds. Non-GMO, annual, organic, heirloom, open-pollinated. This crop is suitable for containers, garden plots, raised beds, and fields. Classic purple-skinned...
Thyme Seeds - Winter (Organic)
95 Days to maturity. Thymus vulgaris. Organic Winter Thyme Seeds. Non-GMO, perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Common Thyme, German Thyme,...
Cucumber Seeds - Armenian Striped
50-75 Days to maturity. Cucumis melo. Armenian Striped Cucumber Seeds. Non-GMO, annual, open-pollinated, heirloom, monoecious, slicing cucumber. Suitable for growing in fields, containers (with support), garden plots, raised beds, and...
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