September is the turning point in warm-winter zones. The brutal heat of summer is easing, and the long, productive fall and winter season that defines gardening here is beginning to take shape. August brassica transplants are going outside. Short-day onion starts are going out or will be soon. And direct sowing of cool-season crops broadens as soil temperatures fall; this is the month the seed packets you have been holding since August finally go in the ground. Order anything you are missing now; the season does not wait.
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): Broccoli, cauliflower, cabbage, and Brussels sprouts started in August are ready to harden off and move outside as daytime temperatures ease into the upper 80s and below. Watch moisture carefully during establishment; the soil is still warm, and transplants will stress quickly if allowed to dry out.
Short-day onion transplants: Short-day bulbing onions started in August go outside in September and October. These need the full fall and winter season to develop — getting them in the ground now is essential.
Crops that can be directly sown outdoors in September: Spinach, kale, collards, Swiss chard, lettuce, arugula, mustard, pak choi, turnip, radish, carrot, bunching onion, cilantro, dill, corn salad, and beet can all go in this month as conditions allow — earlier in the month for more heat-tolerant crops, later as temperatures continue to fall. For spinach and carrots, pre-germination in a cool spot improves germination if the soil is still warm. In Hawaii and other tropical arias, sow in the cooler microclimates available to you.
Cover crops: Cowpeas and sorghum-sudangrass are still viable early in the month. Transition to crimson clover, field peas, or oats as temperatures cool.
Tip: A Southern California zone 10 can be very different from a Florida zone 10. 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 spots run colder.
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![Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites]()
Melon Seeds - Cantaloupe - Imperial 45
65-85 Days to maturity. Cucumis melo. Imperial 45 Cantaloupe Melon Seeds. A non-GMO, annual, open-pollinated, heirloom, AAS winner, heat-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds, and...
Squash Seeds - Winter - Sweet Meat
Non-GMO Sweet Meat Winter Squash is ready in 100 days. USU recommends this variety of winter squash due to the fact it's vigorous, heavy-yielding vines. Fruit on Gill's Sweet Meat...
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...
Nasturtium Seeds - Alaska
54-63 Days to maturity. Tropaeolum majus. Nasturtium Alaska Mix Seeds. Non-GMO, annual, heirloom. Alaska nasturtium is brilliant, easy to grow from seed, and perfectly suited for many dry and temperate...
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...
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...
Bean Seeds - Bush - Strike
50-65 Days to maturity. Phaseolus vulgaris. Strike Bush Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, high-yielding, bush, snap, green bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Leek Seeds - American Flag Leek - Organic
Allium ampeloprasum (105 days) Originated around 1870. Also called "Giant Musselburh" or "Scotch Flag." Leeks date back to the time of the Ancient Egyptians. Their popularity has grown through many...
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...
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....
Tomatillo Seeds - Toma Verde
70 days. Physalis ixocarpa. Toma Verde Tomatillo Seeds. Non-GMO, annual, heirloom, open-pollinated. This crop is suitable for containers, garden plots, raised beds, and fields. Early, prolific green tomatillo with flat-round...
Gazania Seeds - New Day Series
84-91 Days to maturity. Gazania splendens. Gazania New Day Series Seeds. Non-GMO, Annual. New Day Series gazania seeds grow some of the most recognizable summertime blooms both indoors and out!...
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...
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....
Bean Seeds - Bush - Royal Burgundy
50-65 Days to maturity. Phaseolus vulgaris. Royal Burgundy Bush Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, high-yielding, bush, snap bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Bean Seeds - Bush - Blue Lake (Organic)
50-65 Days to maturity. Phaseolus vulgaris. Organic Blue Lake Bush Bean Seeds. Non-GMO, annual, open-pollinated, heirloom snap bush bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
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...
Parsnip - Hollow Crown
Non-GMO, Open-Pollinated, Heirloom Hollow Crown Parsnip Seeds from True Leaf Market. 100 to 120 days. Good storage variety with a sweet taste that grows up to 15" long. Originating in...
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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