March is the month when most gardens really wake up. In colder regions, it is prime time for indoor seed starting and preparing beds. In milder climates, spring planting is already rolling, and in the warmest zones, the garden may be producing heavily while you begin shifting toward heat-loving crops.
Zones 1-7a: These zones experience cold winters with extended periods of freezing temperatures. In March, monitor soil conditions, thaw cycles, and late frosts as you prepare for early outdoor sowing. Indoors, this is a busy month for starting cool-season crops and hardy flowers under lights or in a greenhouse so they are ready to transplant as soon as the weather settles.
Zones 7b-9a: These zones experience mild winter weather and are warming quickly in March. Many cool-season crops can be direct sown outdoors, and succession planting helps keep harvests coming as temperatures rise. It is also a great time to start warm-season favorites indoors while keeping frost protection on hand for unexpected cold snaps. And of course, sprouts and microgreens are always in season indoors!
Zones 9b-12: Depending on your area, March can be peak garden season in these warm-winter zones. Many crops planted earlier are now producing, and this month often marks the transition from late cool-season planting to the start of warm-season gardening. In the hottest areas, you may begin planting heat lovers while timing your last rounds of tender cool-season crops before warmer weather arrives.
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![Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites]()
Rosemary Seeds
2nd year maturity. Rosemary Culinary Herb Seeds. Salvia rosmarinus. Non-GMO. Heirloom. A woody and cold-hardy perennial known to live 15-20 years, culinary rosemary is one of the most persistent and...
Broccoli Seeds - Waltham 29
85-90 days. Waltham 29 Broccoli Seeds. Brassica oleracea var. italica. Annual. Non-GMO. Developed at the University of Massachusetts Amherst's historic research farm, Waltham Field Station, heirloom Waltham 29 broccoli garden...
Broccoli Seeds - Waltham 29 (Organic)
85-90 days. Organic Waltham 29 Broccoli Seeds. Brassica oleracea var. italica. Annual. Non-GMO. Developed at the University of Massachusetts Amherst's historic research farm, Waltham Field Station, Organic Waltham 29 broccoli...
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...
Tomato Seeds - Paste - Roma VF
75-80 Days to maturity (from transplant). Solanum lycoperscium. Roma VF Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, paste tomato. Suitable for growing in garden plots, raised beds, and greenhouses. Resistant...
Pumpkin Seeds - Sugar Pie
85-100 days. Sugar Pie Pumpkin Seeds. Cucurbita pepo. Non-GMO. Heirloom. Also widely known as the New England pumpkin, the Sugar Pie is a true American heirloom and culinary standard. Non-GMO...
Tomato Seeds - Cherry - Large Red Cherry
75-80 Days to maturity (from transplant). Solanum lycoperscium. Large Red Cherry Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, cherry tomato. Suitable for growing in garden plots, raised beds, and greenhouses....
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...
Watermelon Seeds - Picnic - Crimson Sweet
80-90 Days to maturity. Citrullus lanatus. Crimson Sweet Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, picnic watermelon. Resistant to Anthracnose (1,3), Fusarium Wilt (Race 1,2). Crimson Sweet watermelon...
Watermelon Seeds - Picnic - Crimson Sweet (Organic)
80-90 Days to maturity. Citrullus lanatus. Crimson Sweet Organic Watermelon Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, heat tolerant, seeded, picnic watermelon. Resistant to Anthracnose (1,3), Fusarium Wilt (Race 1,2). Organic...
Oregano Seeds - Common Italian
Origanum vulgare 90 days. Perennial. Non-GMO, Heirloom Common Italian Oregano Herb Garden Seed from True Leaf Market. Common Italian Oregano is a perennial herb often called "Wild Marjoram." With the...
Melon Seeds - Cantaloupe - Hales Best Jumbo
85-110 Days to maturity. Cucumis melo. Hale's Best Jumbo Cantaloupe Melon Seeds. A non-GMO, annual, heirloom, open-pollinated, heat-tolerant, drought-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds, and...
Watermelon Seeds - Mini - Sugar Baby
75-80 Days to maturity. Citrullus lanatus. Sugar Baby Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, mini watermelon. Suitable for growing in garden plots and large containers (minimum 7...
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...
Tomato Seeds - Paste - San Marzano Indeterminate
85 Days to maturity (from transplant). Solanum lycoperscium. San Marzano (Indeterminate) Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, paste tomato. Often compared to the famous Roma tomato in terms of...
Melon Seeds - Cantaloupe - Hales Best Jumbo (Organic)
85-110 Days to maturity. Cucumis melo. Hale's Best Jumbo Cantaloupe Melon Seeds. A non-GMO, annual, heirloom, open-pollinated, organic, heat-tolerant, drought-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds,...
Borage Herb Seeds
60-70 Days. Borage Culinary Herb Seeds. Borago officinalis. Non-GMO. Heirloom. Borage seeds are grown as both an indoor culinary herb and an open-pollinated garden herb. Non-GMO Borage seeds produce some...
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...
Chives Seeds (Organic)
60 days. Organic Chives Culinary Herb Seeds. Allium schoenoprasum. Perennial. Non-GMO. A member of the onion family along with garlic and leeks, Organic chives are a smaller, more tubular relative...
Buckwheat - Organic - Cover Crop Seeds
70-90 Days. Fagopyrum esculentum. Organic. Cover Crop. Heirloom. Non-GMO Organic buckwheat seeds grow an ancient foraging crop that, until recently, wasn't grown for much more than livestock fodder. Open-pollinated Organic...
White Dutch Clover - Cover Crop Seeds
70-90 Days. Trifolium repens. Non-GMO. Cover Crop. Perennial. Open-pollinated White Dutch clover seeds produce a cover crop for gardens lacking in nitrogen and productivity. Non-GMO White Dutch clover seeds quickly...
Echinacea - Purple Coneflower Seeds
2nd Year maturity. Echinacea purpurea. Purple Coneflower Seeds. Non-GMO, Heirloom, Perennial. Echinacea grows as a warm-season perennial and flowering herb native to Eastern North America. These wildflowers are popular, as...
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...
Barley - Whole (Organic) - Grass Seeds
Barley grass sprouting seed, with the hull on (whole barley). Great germination rate and a great seed for sprouting, growing barleygrass and more. Grows healthy, thick bladed barley grass for...
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...
Tomato Seeds - Slicing - Cherokee Purple (Organic)
80-90 Days to maturity (from transplant). Solanum lycopersicum. Organic Cherokee Purple Tomato Seeds. Non-GMO, warm-season annual, organic, open-pollinated, heirloom, heat-tolerant, indeterminate, slicing tomato. Suitable for growing in garden plots, raised...
Tomato Seeds - Paste - San Marzano Determinate
80-90 Days to maturity (from transplant). Solanum lycopersicum. San Marzano Determinate Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, paste tomato. Suitable for growing in garden plots, raised beds, and greenhouses....
Oregano Seeds - Common Italian (Organic)
90 days. Organic Oregano Culinary Herb Seeds. Origanum vulgare. Perennial. Non-GMO. Organic culinary oregano seeds deliver one of the more pronounced, robust, aromatic herbs in the mint family. Tenacious and...
Stevia Seeds - Sweet Herb
40 to 60 days. Stevia rebaudiana Annual in cold climates. 40 to 60 days. Non-GMO, Heirloom Sweet Stevia Herb Garden Seed from True Leaf Market. Stevia rebaudiana. Stevia is a...
Catnip Seeds
Up to 85 days. Foliage is greenish-gray with small blue flowers. Dried leaves can be used for tea and as a stimulant for cats. Small bilabiate blooms can be white,...
Tomato Seeds - Slicing - Cherokee Purple
80-90 Days to maturity (from transplant). Solanum lycopersicum. Cherokee Purple Tomato Seeds. Non-GMO, warm-season annual, open-pollinated, heirloom, heat-tolerant, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, greenhouses....
Brussels Sprouts - Catskill
Brassica oleracea (85-98 days) Introduced to the seed trade in 1941. Catskills produce a richly flavored heirloom brussel sprout that is about 1 1/2"- 2" in diameter. Approx. 8,000 seeds...
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