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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Pumpkin Seeds - Cinderella
95 to 150 days. Cinderella Pumpkin Seeds. Also known as Rouge vif D'Etampes. Kids love this antique french heirloom pumpkin. Flatter than regular pumpkins and darker of color, this is...
Onion (Organic) - Microgreens Seeds
14 to 21 days. Onion Microgreens are very rich in flavor and nutrients. Put just a couple greens on a sandwich or in a salad and taste the flavor! Best...
Bean Seeds - Pole - Kentucky Wonder (Organic)
65 Days to maturity. Phaseolus vulgaris. Organic Kentucky Wonder Pole Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, drought tolerant, high-yielding, pole, snap, romano bean. Suitable for growing in containers, garden plots,...
Cress Seeds - Watercress (Organic)
50-60 Days to maturity. Nasturtium officinale. Organic True Watercress Seeds. Non-GMO, semiaquatic perennial, heirloom. True Watercress is a delightful crop with numerous uses. This easy-to-grow herb is quick to mature...
Pepper Seeds - Sweet - Marconi Red
73 Days to maturity (from transplant). Capsicum annuum. Marconi Red Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, high yielding, drought tolerant, sweet pepper with no heat. 0 Scoville Heat Units. Suitable...
Rudbeckia Seeds - Black-Eyed Susan
84-98 days maturity. Rudbeckia hirta. Rudbeckia Black-Eyed Susan Seeds. Non-GMO, Perennial. Ornamental. Black-Eyed Susan seeds grow some of the season's most timeless and familiar blooms of varieties native to the...
Tomato Seeds - Slicing - Mortgage Lifter
85-90 Days to maturity (from transplant). Solanum lycopersicum. Mortgage Lifter Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and...
Kick Mix - Organic - Sprouting Seeds
4-6 Days. Organic. Non-GMO. High Germination. One of our most celebrated signature mixes ever, the non-GMO Organic Kick Mix is a bright and invigorating seed sprouting blend meant to keep...
Asclepias Seeds - Butterfly Milkweed
91-98 Days to maturity. Asclepias tuberosa. Butterfly Milkweed Seeds. Perennial, non-GMO, heirloom, open-pollinated. Butterfly Weed Asclepias seeds invite perennial color into your home, patio, or garden. Asclepias flowers are easy...
Mustard - Farmer's Favorite Cover Crop Mix
35-45 Days to maturity. Brassica juncea. Farmer's Favorite Mustard Cover Crop Mix Seeds. Non-GMO, Open Pollinated, Annual. This is a blend of several mustards that work well together to provide...
Hairy Vetch - Cover Crop Seeds
80-90 Days. Vicia villosa. Annual. Heirloom. Non-GMO. Such a vigorous annual cover crop that it is considered invasive in much of the United States, non-GMO hairy vetch is a European...
Squash Seeds - Honeynut
Cucurbita moschata (100-110 days) Honey Nut Squash originates from Cornell University. We remember being in Cornell's fields just a few years ago as they were developing this squash. It is...
Radicchio Seeds - Palla Rosa
Heirloom and Non-GMO Palla Rosa Radicchio is ready in 80-85 days in the garden. Radicchio is growing in popularity, and is known for its red leaves with white veins. Palla...
Pepper Seeds - Hot - Large Red Cherry Hot
Non-GMO Large Hot Cherry Pepper ready in 80 days. Hot Cherry Peppers are great for container gardens. These hot peppers are rated between 3,000- 5,000 on the Scoville scale. As...
Carrot Seeds - Chantenay Red Core
65-70 days. Red Core Chantenay carrot Seeds. Daucus carota subsp. sativus. Non-GMO. Heirloom. The Chantenay Red Core carrot seeds produce blunt roots that can grow up to six inches long....
Pea Seeds - Snap - Sugar Daddy
70-80 Days to maturity. Pisum sativum. Sugar Daddy Snap Pea Seeds. Non-GMO, annual, open-pollinated. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Resistant to powdery mildew...
Cabbage Seeds - All Seasons Cabbage
Brassica oleracea var. capitata (87days) (Also known as "The Vandergaw" and "Novelty") A good mid-season cabbage for those regions with a moderate to warm summer. All seasons cabbage is heat...
Shiso Seeds (Perilla) - Green Ohba
60 to 70 days to maturity. Perilla frutescens var crispa. Shiso Herb Seeds (Perilla) - Green Ohba Shiso Seeds. Warm season annual. Shiso, also known as perilla or beefsteak leaf,...
Hard Red Spring Wheat - Organic - Cover Crop Seeds
90 Days. Triticum aestivum. Open-Pollinated. Cover Crop. Organic. Non-GMO Organic Hard Red Spring Wheat cover crop is one of the most tolerant, productive, and beneficial grows available to home gardeners....
Beet Seeds - Chioggia (Organic)
55 Days. Beta vulgaris. Organic. Open-pollinated. Pronounced "key-oh-jah" after the small Venetian villa town, non-GMO Chioggia beet seeds are a classic Italian garden heirloom grown and sold throughout the Mediterranean...
Pepper - Hot - Cayenne Thick
65-85 Days to maturity (from transplant). Capsicum annuum. Cayenne Thick Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, heat-tolerant, hot pepper with hot heat levels. 30,000-50,000 Scoville Heat Units. Suitable for growing...
Cucumber Seeds - Long Green Imp. Slicing
65 Days to maturity. Cucumis sativus. Long Green Improved Slicing Cucumber Seeds. Non-GMO, annual, open-pollinated, heirloom, monoecious, slicing cucumber. Suitable for growing in fields, containers (with support), garden plots, raised...
Watermelon Seeds - Giant - Black Diamond
90 Days to maturity. Citrullus lanatus. Black Diamond Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, Giant watermelon. Developed in Arkansas in the 1950s. Called black diamond because of...
Swiss Chard Seeds - Fordhook Giant
60 days. The Swiss Chard Fordhook Giant is a variety that can grow to be over two feet tall. This plant produced broad, dark green leaves with bright white stems...
Tomato Seeds - Slicing - Beefsteak Determinate
70 Days to maturity (from transplant). Solanum lycoperscium. Beefsteak Determinate Tomato Seeds. Non-GMO, annual, open-pollinated, determinate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses. The plant...
Clover Seeds - Medium Red
Medium Red Clover Seeds. 60-69 days to maturity. trifolium pratense. Open Pollinated, Non-GMO, Annual. Medium red clover is a short-lived perennial used to supply nitrogen. Unlike other legumes, it fixes...
Rye - Winter (Organic) - Sprouting Seeds
1-2 Days to Harvest. Secale cereale. Organic Winter Rye Sprouting Seeds. Organic. Non-GMO. Sprouting. High Germination. Rye is a delicious grain that is related to wheat and barley. This hulled...
Cumin Seeds
100-120 Days. Cuminum cyminum. Annual. Heirloom. Open-pollinated. Similar to coriander, mustard, caraway, and anise, Non-GMO heirloom cumin seeds are just as popularly cultivated for its seeds as it is a...
Basil - Thai - Microgreens Seeds
18-30+ days. Thai Basil Microgreens Seeds are just as easy to grow as other varieties of basil microgreens seeds. Thai Basil, when grown as a microgreen, tastes like basil but...
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