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]()
Chamomile Seeds - Roman
Non-GMO, Heirloom Roman Chamomile Herb Garden Seed from True Leaf Market. Chamaemelum Nobile. Roman Chamomile plants originated from North Africa and were later cultivated in Europe"as chamomile has an ancient...
Tomato Seeds - Slicing - Oregon Spring
58 Days to maturity (from transplant). Solanum lycoperscium. Oregon Spring Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, slicing tomato. Suitable for growing in containers, garden plots, raised beds, greenhouses. Resistant...
Cucumber Seeds - Straight Eight (Organic)
55-65 Days to maturity. Cucumis sativus. Organic Straight Eight Cucumber Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, 1935 AAS-winning, slicing cucumber. Suitable for growing in fields, containers (with support), garden plots,...
Bean Seeds - Pole - Oriental Yard Long
85 Days to maturity. Vigna unguiculata subsp. sesquipedalis. Oriental Yard Long Pole Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, heat-tolerant, pole, snap, Asian, specialty bean. Suitable for growing in containers, garden...
Carrot Seeds - Little Fingers
55 days. The Little Fingers carrot seeds produce adorable mini carrots with a beautiful orange color, packed with flavor! These smaller roots are cylindrical and grow up to 4 inches...
Bean Seeds - Bush - Pinto
90-95 Days to maturity. Phaseolus vulgaris. Pinto Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, bush, shelling bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses. Pinto Beans are...
Bean Seeds - Bush - Tendergreen (Organic)
50-65 Days to maturity. Phaseolus vulgaris. Organic Tendergreen Bush Bean Seeds. Non-GMO, annual, organic, heirloom, high-yielding, heat tolerant, bush, snap, green bean. Suitable for growing in containers, garden plots, raised...
Corn Seeds - Sweet - Stowells Evergreen
95 Days to maturity. Zea mays. Stowells Evergreen Corn Seeds. Non-GMO, annual, open-pollinated, heirloom, Sweet Corn. Suitable for growing in garden plots or raised beds. Corn tolerates heat and drought-prone...
Fennel Seeds - Florence
90-115 days. Foeniculum vulgare var. azuricum. Florence Fennel Seeds. Non-GMO, short-lived perennial herb, heirloom, open-pollinated. This crop is suitable for garden plots, raised beds, and containers. Florence fennel is a...
Artichoke Seeds - Green Globe
110-150 days. Artichoke Gardening Seeds. Cynara cardunculus var. scolymus. Perennial. Heirloom. Non-GMO. Native to the Mediterranean, Green Globe artichoke seeds have been grown for decades, and their fruits were eaten...
Squash Seeds - Summer - Crookneck (Organic)
Ready in about 58 days, Organic Summer Crookneck Squash is perfect for the summer garden. Bumpy skin highlights a yellow fleshy squash. When the fruit is 5-6 inches long, it...
Bean Seeds - Pole - Qing Bain
50-55 Days to maturity. Phaseolus vulgaris. Qing Bian Pole Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, drought tolerant, pole, snap, romano, Asian bean. Suitable for growing in containers, garden plots, raised...
Melon Seeds - Honeydew - Green Flesh
105 Days to maturity. Cucumis melo. Green 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....
Corn Seeds - Flint - Hopi Blue
100 Days to maturity. Zea mays. Blue Hopi Corn Seeds. Non-GMO, annual, open-pollinated, heirloom, Flint and Flour Corn. Suitable for growing in garden plots or raised beds. Corn tolerates heat...
Wildflower Seeds - Bee Friendly Mix
Grow a delightful, charming wildflower garden with our Bee Friendly Wildflower Mix. Features 19 wild flower varieties such as coneflower plants for pollination, alyssum flower seeds, poppy seeds, and lupine...
Basil Seeds - Thai
60-90 days. Non-GMO, Open-pollinated, Heirloom Thai Basil Herb Seed from True Leaf Market. Ocimum basilicum var. thyrsiflora is native to various Asian regions, such as India and Iran. As basil...
Tomato Seeds - Cherry - Sunsugar Hybrid
62 Days to maturity (from transplant). Solanum lycoperscium. Sunsugar Hybrid Tomato Seeds. Non-GMO, annual, F1 hybrid, indeterminate, cherry tomato. Suitable for growing in garden plots, raised beds, greenhouses, and containers....
Kohlrabi Seeds - Purple Vienna
Non-GMO, Heirloom Purple Vienna seeds produce kohlrabi with purple bulbs and a light green interior. The flavor is mild, resembling the taste of a turnip. This unusual looking vegetable comes...
Tomato Seeds - Slicing - Big Beef Hybrid
73 Days to maturity (from transplant). Solanum lycopersicum. Big Beef Hybrid Tomato Seeds. Non-GMO, annual, F1 hybrid, AAS winner 1994, heat tolerant, drought tolerant, indeterminate, slicing tomato. Suitable for growing...
Wild Arugula - Herb Seeds
40-45 days. Diplotaxis tenuifolia. Non-GMO. Heirloom. Annual. Non-GMO Wild arugula seeds grow far more tolerant and perennial relative to the common arugula or "garden rocket". Although still bright and peppery,...
Pea Seeds - Shelling - Green Arrow (Organic)
65-75 Days to maturity. Pisum sativum. Organic Green Arrow Pea Seeds. Non-GMO, annual, open-pollinated, heirloom, treated pea seeds. Long, slim, 4.5-inch pods grow in pairs on strong 28-inch vines. Suitable...
Bean Seeds - Pole - Winged Bean
80-100 Days to maturity. Psophocarpus tetragonolobus. Winged Bean Seeds. Non-GMO, annual, heirloom, open-pollinated, heat-tolerant, pole, snap, Asian, specialty bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Pumpkin Seeds - Howden
Non-GMO, Heirloom Howden Pumpkin Seeds. 115 days. Uniform 15 to 25 pound, deep round, symmetrical fruits with a thick, hard, rich-orange shell and extra-thick flesh for fine Jack O' Lanterns....
Pepper Seeds - Hot - Jalapeno M
70-80 Days to maturity (from transplant). Capsicum annuum. Jalapeno M Pepper Seeds. Non-GMO, annual, heirloom, open-pollinated, hot-type pepper with medium heat levels. 2,500 to 5,000 Scoville Heat Units. Suitable for...
Sunflower Seeds - Dwarf Sunspot
65-80 Days to maturity. Helianthus annuus. Dwarf Sunspot Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Annual. Heirloom. Dwarf Sunspot sunflower seeds grow the ideal compact alternative to summer's tallest and most...
Beet Seeds - Ruby Queen
52 days. The Ruby Queen beet is a variety that does very well in poor soils. It produces uniform, round globes and short tops. The leaves grow to be green...
Gourds Seeds - Luffa Sponge
100+ days. 12 to 18 inches fruits are dried and seeded to make durable sponges. Approximately 320 seeds/oz. Luffa Gourd seeds yield green gourds that can be used for making...
Watermelon Seeds - Picnic - Jubilee
90-97 Days to maturity. Citrullus lanatus. Jubilee Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, picnic watermelon. Suitable for growing in garden plots. These large picnic varieties can grow...
Petunia Seeds - Madness Series (pelleted)
98-105 Days to maturity. Petunia x hybrida. Pelleted Madness Series Petunia Seeds. Non-GMO, hybrid, Premium Quality Seeds, annual. Madness Series petunia seeds are an easy way to splash some early-blooming...
Beet Seeds - Early Wonder Tall Top
35-60 days. The Early Wonder Tall Top is an easy to grow beet that can be harvested as early as thirty five days after planting, and thrives in colder weather....
Tomato Seeds - Cherry - Yellow Pear (Organic)
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...
Sunflower Seeds - All Sorts Mixture
90-110 days. All Sorts Mix sunflower seeds grow one of the most spectacular, vibrant, and unique pairings of color and size in this blend of summertime classics. All Sorts Mix...
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