September is the month the calendar and the thermometer finally agree. In most parts of the country, the heat is beginning to break, and the days are noticeably shorter — two signals the garden has been waiting for. In cold winter zones, September is a sprint to the finish: a few seeds can still go in the ground, but the window is closing fast, and the emphasis shifts to transplanting and harvesting. For mild-winter zones, September is prime planting season — the single best month to get cool-season crops in the ground for fall. And for warm-winter zones, September is the real beginning of the gardening year: heat is easing, transplants are going out, and the prime growing season is just getting started.
Cold Winter Zones (3–7): The direct-sow window is nearly closed, but it is not gone. Radishes are the last reliable bet — fast enough to mature before October's frost if you sow them in the first week of September. Brassica transplants started in July and August are the main event now: get them in the ground while there are still 6–8 weeks of growing weather ahead—if you have not ordered yet, order today.
Mild Winter Zones (8–9a): September is your month. Cool-season crops of every kind — leafy greens, root vegetables, brassicas, alliums — go in now. August indoor starts are hardening off and moving outside. Short-day onion transplants are going in. The fall garden is assembling itself in real time, and the seed orders that support it need to happen now.
Warm Winter Zones (9b–12): The turning point has arrived. September is when the fall and winter garden takes physical shape in warm-winter zones. Brassica transplants started in August and will go outside as temperatures ease. Direct sowing of cool-season crops is broadly open. The fall season that defines gardening here — the one that runs from October through March — depends on seeds ordered and planted this month.
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![Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites]()
Lettuce Seeds - Tom Thumb - Organic
Lactuca sativa (50 days) Introduced some time in the 1850s. Small, round head with delicate leaves. About the size of a baseball. Perfect for one-person salad. Can be planted close...
Beet Seeds - Red Ace Hybrid
50 days. The Red Ace beet is a variety that is highly adaptable and that can grow in cooler temperatures. The Red Ace matures a week before many other beets,...
Onion - Long - Southport White Globe 404
70-110 Days to maturity. Allium cepa. Southport White Globe Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, and raised beds....
Carrot Seeds - Cosmic Purple - Organic
(58 days) Purple on the outside and bright orange on the inside, these carrots are a real show stopper! Have trouble getting the kids to eat carrots? Cosmic Purple to...
Onion Seeds - Bunching - Ishikura Winter Long
40-60 Days to maturity. Allium fistulosum. Ishikura Winter Long Japanese Bunching Onion Seeds. Non-GMO, annual, perennial, open-pollinated, heirloom, cold hardy, bunching onions. Suitable for growing in greenhouses, garden plots, raised...
Cucumber Seeds - Japanese Long
The Japanese Long cucumber plant produces productive yields of 18-20 inches long fruits. Cucumbers are dark green and burpless with few seeds. They are best when harvested prematurely at 12...
Pak Choi Seeds - Wa Wa Qing - Hybrid
30-35 Days to maturity. Brassica rapa Chinensis group. Wa Wa Qing, Pak Choi (Bok Choy) Seeds. Hybrid Non-GMO Annual. This is a “Shanghai baby” pak choi variety. Plants grow upright,...
Eggplant Seeds - Japanese Pickling
Japanese Pickling Eggplant Seeds. 65 days to maturity. Heirloom, Annual. Can be grown in containers. Solanum melongena. These purple slender, slightly curved eggplants, are full of flavors as they are...
Cucumber Seeds - Bush Crop
55 days. Bush Crop is an excellent variety for small gardens. This plant produces 6 to 8 inch, slightly tapered fruits on a dwarf vine. A very productive plant, Bush...
Corn Seeds - Sweet - Ambrosia Hybrid (treated)
80-90 Days to maturity. Zea mays. Ambrosia Hybrid Corn Seeds. Non-GMO, annual, hybrid, Sweet Corn. Suitable for growing in garden plots or raised beds. Corn tolerates heat and drought-prone regions....
Cucumber Seeds - Housaku - Hybrid
55-60 Days to maturity. Cucumis sativus ‘Housaku’. Housaku Cucumber Seeds. Warm-season annual hybrid. Non-GMO. The name “housaku” means “good harvest” and it lives up to the name! It is a...
Lettuce Seeds - Black Seeded Simpson - Organic
Lactuca Sativa (45 days) An old reliable lettuce that is heat resistant, slow to bolt and very dependable. Leaves are large, but lightly crispy and ruffled. Excellent for spring, early...
Melon Seeds - Korean - Dae Jang Geum Hybrid
65 Days to maturity. Cucumis melo var. makuwa. Dae Jang Geum Korean Hybrid Melon Seeds. A non-GMO, annual, hybrid, heat tolerant, drought tolerant, Asian Melon. Suitable for growing in garden...
Eggplant Seeds - Rosa Bianca - Organic
Solanum melongena (81 days) This beautiful pink-purple fruit also has white shading. Rosa Bianca eggplant is 4-6" in size. Rarely bitter. Heat lover, but produces well even in Coastal areas....
Mustard Seeds - Old Fashioned
B. juncea (42 days) Old Fashioned Mustard is the classic mustard typically found in Southern gardens of yesteryear. It is still widely grown in the South for its reliability and...
Pak Choi Seeds - Red Tatsoi - Hybrid
45 Days to full maturity, 20-30 Days for baby leaf, 10-15 Days for microgreens. Brassica rapa subsp. narinosa. Red Tatsoi, Pak Choi Seeds. Annual, Hybrid. Cool Season. This vigorous hybrid...
Lettuce Seeds - Butterhead - Kagraner Sommer
50-60 days. Non-GMO. Open-pollinated. Kagraner Sommer Lettuce Seeds from True Leaf Market produce a butterhead lettuce with light green leaves that is slow to bolt. Also known as Kagran Summer...
Pea Seeds - Thomas Laxton
60-70 days. Pisum sativum Non-GMO. Heirloom. A true American heirloom, this pea originated in rural England in the 1800s and was bred by Thomas Laxton's sons who named the variety...
Melon Seeds - Honeydew - Orange Flesh
105 Days to maturity. Cucumis melo. Orange Flesh Honeydew Melon Seeds. A non-GMO, annual, open-pollinated, heirloom, heat-tolerant Honeydew Melon. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Carrot Seeds - Purple Haze Hybrid
70 days. The Purple Haze carrot produces roots with a beautiful blend of purple and orange that looks almost tie dye-like. Each carrot has a deep purple exterior with a...
Chinese Mustard Seeds - Shuidong
35 to 45 Days to maturity. Brassica juncea. Shuidong Chinese Mustard Seeds. Non-GMO, Heirloom, non-GMO, Cool Season Annual. Shuidong mustard is named after the town where it was first cultivated,...
Beet Seeds - Red Mammoth Mangel
Beta vulgaris (100 days) Fodder beets have been around since the 1400s if not earlier. These beets were prized as nutritious animal feed that was easy to store. Fodder beets...
Tomato Seeds - Cherry - Gum Drop Black Hybrid
75 Days to maturity (from transplant). Solanum lycoperscium. Gum Drop Black Hybrid Tomato Seeds. Non-GMO, annual, F1 hybrid, indeterminate, cherry tomato. Suitable for growing in garden plots, raised beds, and...
Borage Seeds (Organic)
60-70 Days to maturity. Borago officinalis. Organic Borage Seeds. Non-GMO, annual, open-pollinated, heirloom herb. Borage is commonly referred to as a starflower due to its beautiful, star-shaped blue flowers. This...
Onion Seeds - Bunching - White Ishikura (Organic)
60-66 Days to maturity. Allium fistulosum. Organic Bunching White Ishikura Onion Seeds. Non-GMO, annual, perennial, organic, open-pollinated, heirloom, cold hardy, bunching onion. Suitable for growing in greenhouses, garden plots, raised...
Cucumber Seeds - Armenian (Organic)
63 Days to maturity. Cucumis Melo. Organic Armenian Cucumber Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, monoecious, slicing cucumber. Suitable for growing in fields, containers (with support), garden plots, raised beds,...
Tomato Seeds - Slicing - Beefsteak Rainbow Blend
85 Days to maturity (from transplant). Solanum lycopersicum. Beefsteak Rainbow Mix Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses....
Onion Seeds - Intermediate - Red Torpedo
110 Days to maturity. Allium cepa. Red Torpedo Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, bulbing, intermediate-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. A fantastic onion...
Cucumber Seeds - Armenian (The Duke)
65 Days to maturity. Cucumis melo. The Duke Armenian Cucumber Seeds. Non-GMO, annual, open-pollinated, heirloom, monoecious slicing cucumber. Suitable for growing in fields, containers (with support), garden plots, raised beds,...
Onion Seeds - Bunching - White Lisbon
40-60 Days to maturity. Allium fistulosum. White Lisbon Onion Seeds. Non-GMO, annual, perennial (see zone info), open-pollinated, heirloom, cold hardy, heat tolerant, drought tolerant, bunching onion. Suitable for growing in...
Tomato Seeds - Salad - Jubilee
72-85 Days to maturity (from transplant). Solanum lycopersicum. Jubilee Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, 1943 AAS winner, indeterminate, salad tomato. Suitable for growing in garden plots, raised...
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