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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Peppermint Seeds
90 Days. Peppermint Culinary Herb Seeds. Mentha sp. Non-GMO. A deliciously versatile and bright herb, peppermint seeds are a naturally occurring hybrid between culinary spearmint and watermint. Grown very similar...
Lemongrass Seeds - West Indian
90-100 days. West Indian Lemongrass Culinary Herb Seeds. Cymbopogon citratus. Non-GMO. Heirloom. West Indian lemongrass seeds grow the edible, tender, and delicious cultivar of lemongrass. Not to be confused with...
Crimson Clover - Cover Crop Seeds
70-90 Days. Trifolium incarnatum. Cover Crop. Non-GMO. Annual. Heirloom crimson clover seeds are an ideal annual garden companion and cover crop for plants and soils deficient in nitrogen. Use to...
Lemon Balm Seeds
Melissa officinalis Perennial. Non-GMO, Heirloom Lemon Balm Herb Garden Seed from True Leaf Market. Melissa officinalis. Lemon Balm resides in the mint family and is native to regions in West...
Spearmint Seeds
50-70 Days to maturity. Mentha spicata. Spearmint Seeds. Non-GMO, perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Enjoy the vibrant, fruity aroma of...
Crimson Clover - Organic - Cover Crop Seeds
70-90 Days. Trifolium incarnatum. Organic. Cover Crop. Non-GMO. Heirloom Organic crimson clover seeds are an ideal annual garden companion and cover crop for plants and soils deficient in nitrogen. Use...
Peppermint Seeds (Organic)
Perennial herb garden seeds. Certified Organic by Oregon Tilth. Non-GMO, Heirloom Peppermint Herb Garden Seed from True Leaf Market. Mentha sp. Peppermint plants are cool perennial and hybrid mints native...
Impatiens Seeds - Accent Series
70-77 Days to maturity. Impatiens walleriana. Accent Series Impatiens Seeds. Non-GMO, hybrid, annual. Premium Quality Seeds. Accent Series seeds deliver the country's most popularly grown and undisputed summertime bloom. Impatiens...
Broccoli Seeds - Chinese Broccoli - Kailaan
Broccoli Seeds - Chinese Broccoli - Kailaan. Heirloom, Non-GMO. Brassica oleracea var alboglabra. Also known as cai ro, chair lan, Chinese broccoli, Chinese kale, gailaan, gai lan, gailon, gelancai, guy...
Broccoli Seeds - Chinese Broccoli - Late Jade - Hybrid
60-70 days to maturity. Brassica oleracea var alboglabra ‘Late Jade’. Late Jade Chinese Broccoli Seeds. Non-GMO, Hybrid, Cool-season Annual. Originating in the Mediterranian, Chinese Broccoli was introduced to China in...
Lobelia Seeds - Regatta Series (MSP)
77-84 Days to maturity. Lobelia erinus. Regatta Series Lobelia Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, annual. Open Pollinated. Regatta Series seeds promise exotic, radiant, and fragrant lobelia mounds that promise...
Lobelia Seeds - Sapphire
77-84 Days to maturity. Lobelia erinus. Sapphire Lobelia Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, annual. Open Pollinated. Sapphire lobelia seeds grow one of summer's most exciting bedding, trailing, and hanging...
Catmint Seeds - Blue Moon
60-80 Days to maturity. Nepeta nervosa. Blue Moon Cat Mint Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, perennial. This heat-tolerant flowering herb is just the versatile plant that your garden needs!...
Hypoestes Seeds - Splash Select Series
74-84 Days to maturity. Hypoestes phyllostachya. Splash Select Series Hypoestes Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, annual. Open Pollinated. Splash Select Series Hypoestes seeds grow adorable, colorful foliage for shaded...
Chinese Leek Seeds - Flowering
65-75 days to maturity. Allium tuberosum ‘Flowering’. Flowering Chinese Leek Seeds. Non-GMO, cool-season perennial heirloom. This popular Chinese specialty herb is a vigorous perennial. It is grown for its young...
Cauliflower Seeds - Song TJS-65 - Hybrid
55-60 Days in Spring, 65-70 Days in Fall to maturity Brassica oleracea var. botrytis. Cauliflower Seeds - Song TJS-65. Annual, Hybrid. This is a non-GMO seed that has a yellowish...
Grass Mix - Cabin Grass Seed
Cabin Grass Seed Mix - AKA: Green Space Holder, Dryland Turf Mix, Erosion Turf Mix. This Cabin Grass Seed Mix is a blend of two low growing, very deep rooted...
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...
Amaranthus Seeds - Early Splendor
70-77 Days to maturity. Amaranthus tricolor. Early Splendor Amaranthus Seeds. Non-GMO, heirloom, annual. Ornamental Plant. Edible. Early Splendor Amaranthus seeds are a stunning, simple, and exotic tropical plant ideal for...
Sweet Pea Seeds - High Scent
75-85 Days to Maturity. Lathyrus odoratus. Sweet Pea High Scent Seeds. Non-GMO, annual, open-pollinated flower seeds. High Scent sweet peas are a timeless and brilliant addition to any home or...
Alternanthera - Purple Knight
70-77 Days to maturity. Alternanthera dentata. Alternanthera Purple Knight Seeds. Non-GMO, Annual or Perennial. Purple Knight Alternanthera seeds promise an exotic and neat ornamental foliage ideal for many humid gardens...
Lobelia Seeds - Vulcan Red (Pelleted)
77-84 Days to maturity. Lobelia speciosa. Vulcan Red Lobelia Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, perennial. Open Pollinated. Vulcan Red Cardinal Flower seeds deliver exotic, early-blooming, and easy-to-grow lobelia plants...
Parsley Seeds - Italian Giant (Organic)
70-80 Days to maturity. Petroselinum crispum. Organic Italian Giant Parsley Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Italian Giant...
Spinach Seeds - Red Malabar
70 days. Basella rubra. Red Malabar Spinach Seeds. Non-GMO, warm-season annual, heirloom, open-pollinated. This crop is suitable for trellised garden plots, raised beds, and large containers. Red Malabar is a...
Parsley Seeds - Italian Giant
70-80 Days to maturity. Petroselinum crispum. Italian Giant Parsley Seeds. Non-GMO, annual, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Italian Giant parsley brings...
Ageratum Seeds - Blue Horizon (Pelleted)
77-91 Days to maturity. Ageratum houstonianum. Blue Horizon Ageratum Seeds. Non-GMO, Ornamental, Annual. Open-pollinated flower seeds. Blue Horizon flower seeds grow one of the season’s most exclusive blooms of exotic...
Kale Seeds - Garden Blend
Garden Blend Kale Seeds. 70 - 80 days to maturity. Brassica oleracea. Open-pollinated. Annual. Everyone wants to grow the best of the best in garden performance. Kale Garden Blend's component...
Parsley Seeds - Double Curled
75 Days to maturity. Petroselinum crispum. Double Curled Parsley Seeds. Non-GMO, annual, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Double Curled Parsley is...
Calendula Seeds - Fiesta Gitana
60-70 Days to maturity. Calendula officinalis ’Fiesta Gitana’. Fiesta Gitana Calendula Seeds. Non-GMO, open-pollinated, heirloom, annual, also known as pot marigold. This one-of-a-kind dwarf marigold, known as Fiesta Gitana, is...
Burdock Seeds - Ha Gobo
65-75 days to maturity.Arctium lappa. Ha Gobo Burdock Seeds. Non-GMO, Heirloom, Cool-season Annual. Open-pollinated. Burdock has been grown for centuries, mainly in China and Japan, for its culinary and medicinal...
Ageratum Seeds - Dwarf Blue Mink
75-90 Days to maturity. Ageratum houstonianum ’Dwarf Blue Mink’. Dwarf Blue Mink Ageratum Seeds. Non-GMO, ornamental, annual, open-pollinated flower seeds. Dwarf Blue Mink flower seeds grow one of the season’s...
Parsley Seeds - Kitchen Garden Blend (Organic)
70-99 Days to maturity. Petroselinum crispum. Organic Kitchen Garden Blend Parsley Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Organic...
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