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]()
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....
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...
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,...
Zucchini Seeds - Round
Cucurbita pepo Round Zucchini is a stunning plant with speckled green leaves born on a robust bush-type plant. Super fast growing and are generally eaten when they are 3-4" in...
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...
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...
Sunflower Seeds - Maximilian
90-110 Days to maturity. Helianthus maximiliani. Maximilian Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Perennial. Heirloom. Maximilian sunflower seeds grow a playful and unique perennial variation on a classic summertime favorite....
Radish Seeds - Crimson Giant
Raphanus sativus (29 to 40 days) Sometimes called Crimson "Giant Globe Radish" or "Giant Butter Radish". Crimson Giant Radish seeds grow large 1 1/2 - 2" globe shaped crimson red...
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,...
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...
Tomato Seeds - Slicing - Big Rainbow
85-90 Days to maturity (from transplant). Solanum lycopersicum. Big Rainbow Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses. Resistant...
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...
Tomato Seeds - Paste - Napoli
75-90 Days to maturity (from transplant). Solanum lycoperscium. Napoli Tomato Seeds. Non-GMO, annual, open-pollinated, determinate, Italian paste tomato. Suitable for growing in garden plots, raised beds, and greenhouses. Resistant to...
Pepper Seeds - Sweet - Giant Aconcagua
70 Days to maturity (from transplant). Capsicum annuum. Giant Aconcagua Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, high-yielding, sweet pepper with no heat. 0 Scoville Heat Units. Suitable for growing in...
Watermelon Seeds - Giant - Congo
95 Days to maturity. Citrullus lanatus. Congo Watermelon Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, heat tolerant, seeded, giant watermelon. Resistant to Anthracnose (1). Congo Watermelon produces sweet, red-fleshed melons up...
Corn Seeds - Sweet - Incredible R/M Hybrid
85 Days to maturity. Zea mays. Incredible Hybrid R/M Corn Seeds. Non-GMO, annual, hybrid, Sweet Corn. Suitable for growing in garden plots or raised beds. Corn tolerates heat and drought-prone...
Cucumber Seeds - Bushy
48 Days to maturity. Cucumis sativus. Bushy Cucumber Seeds. Non-GMO, annual, open-pollinated, heirloom, monoecious, all-purpose cucumber for pickling or slicing. Suitable for growing in fields, containers (with support), garden plots,...
Basil Seeds - Spicy Globe
Non-GMO, Spicy Globe Basil Herb Seed from True Leaf Market. Ocimum basilicum. As basil has many different varieties, Spicy Globe Basil is a dwarf hybrid and one of the smallest...
Carrot Seeds - Nantes Mini Core
Nantes Mini Core carrots are an excellent carrot to grow in a home garden. This variation produces roots that have little to no core, giving them a great crunch. Plant...
Radish Seeds - Easter Egg - Organic
Raphanus sativus (30 days) Oh what fun! Hunt Easter "egg" radishes in your own garden. Amazing array of colors will pop from your garden and straight into your salad bowl....
Pepper Seeds - Hot - Wicked Ghost Hybrid
110-119 Days to maturity (from transplant). Capsicum chinense. Wicked Ghost Hybrid Pepper Seeds. Non-GMO, annual, F1 hybrid, deer resistant, hot pepper with extremely hot heat levels. 700,000 to 900,000 Scoville...
California Poppy Seeds - Mission Bells
56-70 Days to maturity. Eschscholzia californica. Mission Bells California Poppy Seeds. Non-GMO, annual. Mission Bells California poppy seeds grow a classic, durable, and authentic touch of the cool California hills...
Radish Seeds - Golden Helios
Golden Helios Radish Seeds. 26 days to maturity. Raphanus sativus. Heirloom, Annual. Radish Helios was named after the Greek god of the sun. This olive-shaped radish is bright yellow with...
Cucumber Seeds - Tasty Green Hybrid
55-60 Days to maturity. Cucumis sativus ‘Tasty Green’. Tasty Green Cucumber Seeds. Warm Season Annual Hybrid. This early-maturing, heavy-yielding variety is sure to be the perfect addition to your garden....
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...
Pepper Seeds - Hot - Japanese Yatsufusa
70-80 Days to maturity (from transplant). Capsicum annuum. Yatsufusa Japanese Hot Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, deer resistant, hot pepper with hot heat levels. 40,000 to 75,000 Scoville Heat...
Tomato Seeds - Paste - Amish Paste
75-90 Days to maturity (from transplant). Solanum lycoperscium. Amish Paste Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, indeterminate, paste tomato. Amish Paste tomato plants produce one of the largest varieties of...
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