May is the main planting kickoff in cold-winter zones, when gardens finally move from starts and prep into full outdoor action. Early May often still favors hardy transplants and direct-sown cool-season crops, while mid-to-late May is when many areas can safely set out warm-season plants as frost risk drops. Keep hardening off seedlings, use row cover if nights run cold, and focus on steady watering and early weed control so young plants establish quickly.
Indoors (fresh harvests):
-
Microgreens: peas, broccoli, sunflowers, arugula
-
Sprouts: alfalfa, broccoli, radish, mung
-
Herbs & greens under lights: chives, parsley, mint
Crops to start indoors in good light: tomato, pepper, eggplant, basil, cucumber, squash, melons, zinnia, marigold
Transplants to move outdoors (harden first): broccoli, cabbage, cauliflower, kohlrabi, lettuce, onion, parsley, pansies, snapdragons — and by mid-to-late May, tomato, pepper, and eggplant as frost risk drops
Crops that can be directly sown outdoors in May: peas, spinach, kale, Swiss chard, beets, carrots, radishes, turnips, parsnip, dill, cilantro — and after last frost: beans, corn, cucumber, squash, sunflower, nasturtium, sweet peas
Cover crops: oats, field peas, hairy vetch, red clover
Tip: This zone group covers a lot of territory. Nothing replaces talking with experienced gardeners in your area and watching the weather closely.
Use your USDA zone as a guide. Microclimates matter — coastal/urban spots run warmer; high elevation runs colder.
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Pea - Green Arrow - Microgreens Seeds
8-14 days. A shorter variety of pea microgreens (shoots), but very consistent in growth and flavor. Green Arrow pea microgreens are a less-sweet favorite of ours! Uniform in growth like...
Lettuce Leaf - Grand Rapids - Microgreens Seeds
14 to 16 days"possibly 21 days if growing to baby green stage. A crisp microgreen that grows uniformally, Grand Rapids microgreens seeds are high-quality seeds for growing both microgreens and...
Pea Seeds - Maple - Microgreens Seeds
5-8 days. Maple pea shoots are a fast and easy microgreens seeds to grow--and well worth it. Pale brown pea seeds germinate into vibrant green pea shoots that, once they...
Pea - Lincoln - Microgreens Seeds
8-14 days. Lincoln Pea microgreens (shoots) are shorter and very leafy. Their flavor is more on the bitter side. They still taste like peas, only without all the sweetness -...
Broccoli Seeds - Ramoso Santana - Microgreens
Ramoso Santana Broccoli Seeds. 48 to 70 days. Brassica Oleracea. Non-GMO, Open Pollinated. A rare and little known crop of sprouting broccoli, Ramoso Santana is a delicious and slow-bolting Mediterranean...
Salad Burnet Herb Seeds - Microgreens
Salad Burnet Herb Garden Seeds. 70 to 100 Days. Sanguisorba minor. Non-GMO, Heirloom, Open Pollinated. Perennial in USDA zones 4 to 8, but can be grown as an annual. Makes...
Mustard Seeds - Greenwave - Microgreens
8 to 12 days. Greenwave Mustard Microgreens Seeds. This variety of mustard microgreens carry the classic mustard spice that is expected with mustards. Germination is quick, taking root within a...
Cauliflower - Igloo - Microgreens
Igloo cauliflower microgreens seeds. Tolerant to cooler temps, a great microgreens choice where your temps might be cooler. ~9000 Seeds per Ounce. Select a Different Use for This Seed: Garden...
Radish Seeds - Pink Summercicle - Microgreens
Pink Summercicle Radish Microgreens Seeds. Non GMO. Microgreens. Raphanus sativus. Pink Summercicle radish is an easy 8-12 day indoor microgreen crop that boasts all the same bold, spicy flavors as...
Lettuce Leaf - Red Sails - Microgreens Seeds
14 to 16 days"possibly 21 days if growing to baby green stage. Red Sails Microgreens seeds grow well in cooler temperatures and germinate uniformally like other lettuce microgreens. With a...
Cauliflower Seeds - All Year Round - Microgreens
All Year Round Cauliflower microgreens seeds. Sturdy cauliflower for microgreens. ~9000 seeds per ounce. Select a Different Use for This Seed: Garden Cauliflower Microgreens Seeds - All Year Round Brassica...
Cabbage - Glory of Enkhuizen - Microgreens Seeds
Glory of Enkhuizen cabbage can be planted indoors or outdoors. For indoor growth, plant ¼‚ beneath the soil surface and transplant outdoors directly before the final frost of the season....
Kale Seeds - Red - Microgreens Seeds
4-6 days. This variety of red kale microgreens are super vibrant along with being full of flavor. Full brassica kale vegetable flavor in just a time kale microgreen. Approx. 8,000...
Basil Seeds - Anise - Microgreens
25+ days. Premium Non-GMO Anise Basil microgreens seeds. Ocimum basilicum. Anise Basil seeds is unique in that it has zesty basil flavors with sweet licorice-like flavors incorporated. Available in paper...
Lettuce Leaf - Prizehead - Microgreens Seeds
14 to 16 days"possibly 21 days if growing to baby green stage. Prizehead lettuce microgreen exhibit a "leafier" characteristics unlike many of the other microgreens seeds. The flavor of these...
Mustard Seeds - Mibuna - Microgreens
Mibuna Mustard Seeds. 41 Days. Brassica rapa var. japonica. Open Pollinated, Non-GMO. Similar mizuna greens, the mibuna mustard is a flavorful Japanese green strap leaf mustard with mild mustard flavor....
Ultimate Hydroponic Microgreens Seed Mix
Our Ultimate Hydroponic Microgreens Seeds Mix contains a wide array of varieties that can be grown and harvested at the same time. An adventurous choice for both new and experienced...
Corn Salad Seeds - French - Microgreens
French Corn Salad Microgreens Seeds. Non-GMO, Heirloom Seeds. Valerianella olitoria. AKA: Lamb's Lettuce, Mache. Corn salad has green leaves with a nutty flavor that makes a fantastic addition to salads....
Radish Seeds - Pink Beauty - Microgreens
Pink Beauty radishes are uniform light pink with tender white flesh. They have a delicious sweet and spicy flavor. They are easy to grow at home, and produce high yields....
Radish Seeds - Crayon Colors Mix - Microgreens
8-12 days. Crayon Colors Mix Radish Microgreens Seeds are easy to grow and maintain. Non-GMO, Heirloom seeds for healthy growth. Raphanus sativus. A blend of radish microgreens seeds that offers...
Sunflower Seeds - Black Mammoth (Organic)
80 Days to maturity. Helianthus annuus. Organic Black Mammoth Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Annual. The Black Mammoth sunflower is striking and grows up to 10 feet tall and...
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