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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Gourd Seeds - Nam Tao Yai - Hybrid
70-75 Days to maturity. Lagenaria siceraria. Warm-season annual hybrid. Nam Tao Yai Hybrid Seeds. This high-yielding variety is also known as White-flowered gourd, Upo, or Opo and has vigorous, multi-branched...
Watermelon Seeds - Giant - Black Diamond Yellow Belly
90 - 95 Days to maturity. Citrullus lanatus. Black Diamond Yellow Belly Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, giant watermelon. This watermelon has red flesh with a...
Russian Sage Perovskia Seeds - Blue Steel
2nd Year Maturity. Non-GMO, Heirloom Blue Steel Russian Sage Perovskia Herb Garden Seed from True Leaf Market. Perovskia atriplicifolia. Blue Steel Russian Sage is known for its ornamental benefits as...
Kniphofia Seeds - Flamenco
112-126 Days to maturity. Kniphofia uvaria. Flamenco Kniphofia Seeds. Non-GMO, organic, Perennial. Flamenco kniphofia seeds promise exotic, unmistakable, and award-winning blooms native to the cool ocean regions of South Africa's...
Tomato Seeds - Slicing - Kellogg's Breakfast
80 Days to maturity (from transplant). Solanum lycopersicum. Kellogg’s Breakfast Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and...
Tomato Seeds - Slicing - Bradley
80 Days to maturity (from transplant). Solanum lycopersicum. Bradley Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, semi-determinate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses. Bred in...
Salvia Seeds - Victoria Series
98-112 Days to maturity. Salvia farinacea. Salvia Victoria Series Seeds. Non-GMO, perennial or annual. Ornamental. Victoria Series salvia seeds grow a unique and exotic twist to familiar lavender garden favorites....
Basil Seeds - Lemon (Organic)
60 Days to maturity. Ocimum x africanum. Organic Lemon Basil Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Lemon basil...
Cucumber Seeds - Suyo Long
60 Days to maturity. Cucumis sativus. Suyo Long Cucumber Seeds. Non-GMO, annual, open-pollinated, heirloom, parthenocarpic, slicing, burpless, Asian cucumber. Suitable for growing in fields, containers (with support), garden plots, raised...
Cucumber Seeds - White Wonder
Heirloom and Non- GMO White Wonder Cucumber is ready in 35-60 days. Albino cucumbers are a very productive and vigorous variety that produces a 7-9" long fruit. Long white cucumbers...
Marjoram Seeds (Organic)
60-70 Days to maturity. Origanum majorana. Organic Marjoram Seeds. Non-GMO, annual or tender perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, and raised beds. Organic Marjoram is...
Cucumber Seeds - Wisconsin SMR-58 Pickling (Organic)
55-58 Days to maturity. Cucumis sativus. Organic Wisconsin SMR-58 Pickling Cucumber Cucumber Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, monoecious, pickling cucumber. Suitable for growing in fields, containers (with support), garden...
Mustard Seeds - Tat Soi - Organic
Organic Tat Soi Mustard Seeds. 45 days to full maturity. 21 days to maturity for baby leaves. Can be grown in containers. Can be grown as sprouts. Brassica rapa. Heirloom,...
Lobelia Seeds - Cambridge Blue
77-84 Days to maturity. Lobelia erinus. Cambridge Blue Lobelia Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, annual. Open Pollinated. Cambridge Blue lobelia is brilliant, easy to grow from seed, and perfectly...
Tomato Seeds - Slicing - Hillbilly (Organic)
85-94 Days to maturity (from transplant). Solanum lycopersicum. Organic Hillbilly Tomato Seeds. Non-GMO, warm season annual, organic, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds,...
Tomato Seeds - Paste - Hungarian Paste (Organic)
75-85 Days to maturity (from transplant). Solanum lycoperscium. Hungarian Paste (Organic) Tomato Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, indeterminate, paste tomato. It produces good yields of top-quality pear-shaped tomatoes that...
Yu Choy Sum Seeds - Early Green
Yu Choy Sum Seeds - Early Green. Heirloom, Brassica rapa subsp. chinensis. Non-GMO. Warm season annual. 30-40 days. Flowering Brassica is a fast growing green that can be harvested as...
Basil Seeds - Red Rubin (Organic)
68 Days to maturity. Ocimum basilicum. Organic Red Rubin Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. This basil grows...
Okra Seeds - Jade Okra
Abelmoschus esculentus (55 days) Jade Okra Seeds. Jade okra was developed by the University of Arkansas and released around 1991. That wouldn't make it an heirloom, but it is an...
Tomato Seeds - Slicing - Beefsteak Yellow
85 Days to maturity (from transplant). Solanum lycopersicum. Beefsteak Yellow Tomato Seeds. Non-GMO, warm-season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses....
Sesame Seeds - Black Kurogoma
85 days to maturity.Sesame indicum. Black Kurogoma Sesame Seeds. Non-GMO, open-pollinated, perennial. Black sesame seeds differ from other sesame seeds in both color and flavor—they pack a huge punch compared...
Melon Seeds - Honeydew - Earli-Dew Hybrid
80 Days to maturity. Cucumis melo. Earli Dew Hybrid Honeydew Melon Seeds. A non-GMO, annual, F1 hybrid, heat tolerant, Honeydew Melon. Suitable for growing in garden plots, raised beds, and...
Tomato Seeds - Slicing - Watermelon Beefsteak
75 Days to maturity (from transplant). Solanum lycopersicum. Watermelon Beefsteak Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and...
Celosia Seeds - Wheat - Flamingo Series
85-95 Days to maturity. Celosia argentea spicata. Flamingo Series Wheat Celosia Flower Seeds. Non-GMO, Annual. Received the Award of Garden Merit from the Royal Horticultural Society. These stunning Celosias are...
Bean Seeds - Bush - Contender (Treated)
50-65 Days to maturity. Phaseolus vulgaris. Contender Bush Treated Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, high yielding, heat tolerant, bush, snap, stringless bean. Suitable for growing in containers, garden plots,...
Gourd Seeds - Crown of Thorns Shenot
110-125 days. Non-GMO. Heirloom. Shenot Crown of Thorns Gourd Seeds from True Leaf Market yield small decorative gourds featuring blunt, horn-like protrusions which make the gourd resemble a crown of...
Tomato Seeds - Cherry - Fox Cherry
80 Days to maturity (from transplant). Solanum lycoperscium. Fox Cherry Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, cherry tomato. Suitable for growing in garden plots, raised beds, and greenhouses. With...
Tomato Seeds - Slicing - Aunt Ruby's German Green
80 Days to maturity (from transplant). Solanum lycopersicum. Aunt Ruby’s German Green Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and...
Squash Seeds - Winter - Bush Delicata (Organic)
80 to 100 days to maturity. Cucurbita pepo. Organic Bush Delicata Winter Squash Seeds. Non-GMO, annual, heirloom, open-pollinated, AAS 2002. This is suitable for growing in fields, garden plots, raised...
Melon Seeds - Cantaloupe - Honey Rock (Organic)
80 Days to maturity. Cucumis melo. Organic Honey Rock Cantaloupe Melon Seeds. A non-GMO, annual, organic, open-pollinated, heirloom, AAS winner, heat-tolerant Cantaloupe Melon. Suitable for growing in containers, garden plots,...
Saponaria Seeds - Rock Soapwort
240 Days to maturity. Saponaria ocymoides. Rock Soapwort Saponaria Seeds. Non-GMO, perennial. A great spreading ground cover that can be grown from seed. Easy to grow plant spreads to 16...
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