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]()
Cucumber Seeds - Muncher Burpless - Organic
65-70 days. Muncher Cucumber Seeds Organic. Cucumis sativus. Non-GMO. Heirloom. One of the most reliably productive and tolerant grows on the farm or in the home garden, Muncher cucumber has...
Pumpkin Seeds - Big Max
Big Max Pumpkins are known for their size. This is the pumpkin to grow if you want to have an enormous pumpkin. Big Max Pumpkins can weigh over 100 lbs...
Radish Seeds - Watermelon
60-65 days. Watermelon Radish Seeds. Raphanus sativus. Non-GMO. Heirloom. AKA: "Roseheart Radish" or "Red Meat Radish". Watermelon Radish seeds are native to China and a cousin to Daikon radish. Watermelon...
Lettuce Seeds - Romaine - Giant Caesar
Giant Caesar Lettuce Seeds. 70 days to maturity. Lactuca sativa. Heirloom, Annual. The Giant Caesar Lettuce is an amazing bright green loose-leaf romaine type that has a buttery sweet flavor...
Sorrel Seeds - Red Veined
Red Veined Sorrel Seeds. Non-GMO, Heirloom. 55 Days. Perennial. Rumex sanguineus. AKA: Spinach Dock or Narrow-leaved Dock. Tart leaves have lemony taste that some have likend to the flavor of...
Bean Seeds - Bush - Provider
50-65 Days to maturity. Phaseolus vulgaris. Provider Bush Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, high-yielding, heat-tolerant, bush, snap, green bean. Suitable for growing in containers, garden plots, raised beds, and...
Cucumber Seeds - Homemade Pickles
Non-GMO, open-pollinated Homemade Pickles Cucumber Seeds from True Leaf Market yield a pickling-variety of cucumber with small white spines and crunchy cores. Growing on up to 5' disease-resistant vines, the...
Bean - Broad Windsor Fava - Cover Crop Seeds
80-90 Days. Vicia faba. Annual. Cover Crop. Heirloom. Non-GMO Broad Windsor fava bean seeds grow one of the most beneficial heirloom cover crops available to the home gardener. Popularly sown...
Cabbage Seeds - Late Flat Dutch
100 days. The Late Flat Dutch cabbage produces large, pale green heads. It is a hardy garden crop that can be grown in climate zones one through ten. After around...
Bean Seeds - Bush - Roma II
50-65 Days to maturity. Phaseolus vulgaris. Roma II Bush Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, AAS winner, high-yielding, heat-tolerant, bush, snap, romano, green bean. Suitable for growing in containers, garden...
Zinnia Seeds - Lilliput Mixture
54-70 Days to maturity. Zinnia elegans. Lilliput Mixture Zinnia Seeds. Non-GMO, organic, annual. Lilliput Mixture Zinnia Flowers are easy to grow from seeds and ideal for hot and drought-prone gardens....
Swiss Chard Seeds - Ruby Red
55 days. This plant produces good yields of dark green shiny leaves with ruby red stalks and veins. Both the stems and the leaves xcellent for salads and steamed with...
Thyme Seeds - Winter
95 Days to maturity. Thymus vulgaris. Winter Thyme Seeds. Non-GMO, perennial, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Common Thyme, German Thyme, English...
Melon Seeds - Cantaloupe - Hearts of Gold
80-90 Days to maturity. Cucumis melo. Hearts of Gold Cantaloupe Melon Seeds. A non-GMO, annual, open-pollinated, heirloom, heat-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds, and greenhouses....
Cabbage Seeds - Savoy Perfection
90 days. The Savoy Perfection cabbage is a unique variety that doesn't produce the sulfur-like smell that other varieties of cabbage do when they are cooked. It is a hardy...
Petunia Seeds - Double Cascade Series (Pelleted)
98-105 Days to maturity. Petunia x hybrida. Pelleted Double Cascade Series Petunia Seeds. Non-GMO, hybrid, Premium Quality Seeds, annual. Growing Double Cascade Series seeds promise to excite your garden with...
Tomato Seeds - Cherry - Yellow Pear
78 Days to maturity (from transplant). Solanum lycoperscium. Yellow Pear Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, indeterminate, cherry tomato. Suitable for growing in garden plots, raised beds, and...
Cucumber Seeds - Sweet Success Hybrid
60 days. The Sweet Success Hybrid cucumber is a large variety of cucumber that is sweet and tender. The Sweet Success Hybrid is dark green and smooth, and grows to...
Zinnia Seeds - Zahara Series (Coated)
50-60 Days to maturity. Zinnia elegans. Zahara Series Zinnia Seeds. Non-GMO, annual. Zahara Series Zinnia flower seeds are brilliant, easy to grow, and renowned for their hardiness and ability to...
Lettuce Seeds - Leaf - Salad Bowl Green
45-50 days. An AAS winner, these non-GMO Salad Bowl Green seeds grow into green leaves of lettuce that are ready to harvest in 45 to 50 days. The Salad Bowl...
Cabbage Seeds - Early Round Dutch
Brassica oleracea (75 days) Also called "Round Dutch Cabbage" Early round Dutch has solid uniform, oval heads that weigh 2-5 lbs. Small, short-stemmed, short core, good wrapper leaves and slow...
Pepper Seeds - Hot - Bhut Jolokia Ghost
120-129 Days to maturity (from transplant). Capsicum chinense. Bhut Jolokia Ghost Pepper Seeds. Non-GMO, annual, open-pollinated, heirloom, deer resistant, heat tolerant, drought tolerant, hot pepper with extremely hot heat levels....
Lettuce Seeds - Leaf - Oakleaf
Non-GMO Oakleaf lettuce is ready 55-65 days. Utah State University recommends this lettuce strain. The Oakleaf can tolerate colder temperatures. The leaves of the Oakleaf have a mildly sweet flavor,...
Onion Seeds - Bunching - Evergreen White Nebuka
65-120 Days to maturity. Allium fistulosum. Evergreen White Nebuka Onion Seeds. Non-GMO, perennial, open-pollinated, heirloom, cold tolerant, bunching onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers....
Lettuce Seeds - Leaf - Grand Rapids
50-60 days. These non-GMO Grand Rapids lettuce seeds grow into large green leaves that are resistant to tip burn. Grand Rapids Lettuce is ready to harvest in 55 days. The...
Tomato Seeds - Cherry - Gold Nugget
60 Days to maturity (from transplant). Solanum lycoperscium. Gold Nugget Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, cherry tomato. Suitable for growing in garden plots, raised beds, and greenhouses. Resistant...
Gourds Seeds - Birdhouse
110+ days. Fun, easy to grow plants yield gourds that can be made into attractive hanging birdhouses or dippers. Allow fruit to mature on vine as long as possible. Approximately...
Lettuce Seeds - Romaine - Freckles
50-70 days. These non-GMO Freckles lettuce seeds grow into green leaves of lettuce with red spots that are ready to harvest in 50 to 70 days. The Freckles thrives in...
Cucumber Seeds, Japanese - Progress - Hybrid
50-60 Days to Maturity.Cucumis sativus Progress Japanese Cucumber Seeds F1. Hybrid. Non-GMO. Annual. Non-GMO. This Japanese cucumber has glossy, green, smooth skin and is crisp and very tasty. This is...
Pumpkin Seeds - Connecticut Field
Connecticut Field Pumpkin is an heirloom pumpkin that has been around since colonial time. It was first grown by Native Americans in New England. This is the pumpkin to grow...
Onion Seeds - Long - Ruby
100 Days to maturity. Allium cepa. Ruby Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. Ruby...
Portulaca Seeds - Double Mix
84-91 Days to maturity. Portulaca grandiflora. Double Mix Portulaca Seeds. Non-GMO, annual. Double Mix portulaca seeds promise some of the most stunning, and most convenient succulents available to home gardeners....
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