After months of struggling through heat, humidity, and dry spells, gardeners across Texas are eager to fire up their engines again. Just as football kicks off and kids return to school, September launches our “second spring,” a chance to start fresh and fill our gardens with plants that thrive in the coming cool season.
Unlike most of the country, where folks are preparing to put gardens to bed, Texas gardeners are just shifting gears. The weather turns, the nights lengthen, and mornings carry a hint of relief. These seasonal cues tell us it’s time to plant cool-season vegetables, sow seeds for spring-blooming reseeding annuals, and scatter wildflower seed that hopefully will burst forth into bloom when the weather warms again.
Turnips
For vegetable gardeners, September is prime planting time. Properly cared for warm-season crops like tomatoes, peppers, squash, and cucumbers should thrive until our first frost, but it’s too late to plant any more. Real growth and production comes from vegetables that actually prefer cool temperatures and can tolerate frosts.
Broccoli, Brussels sprouts, cabbage, cauliflower, cilantro, collards, dill, kale, lettuce, mustard greens, parsley, spinach, Swiss chard, and turnip greens all thrive in the fall garden. Root crops like beets, carrots, garlic, radishes, onions, and turnips also perform best when planted as the days shorten and nights cool.
Fall greens
One of the benefits of cooler weather is the flavor of the veggies. Leafy greens and root crops often taste sweeter when grown in cooler weather, as the plants respond to chilly nights by producing natural sugars. If you’ve ever eaten greens or carrots harvested in the late fall versus late spring you know what I mean.
Many of these crops can be planted directly from seed, while broccoli, cabbage, and cauliflower are easier to establish from transplants. The key is soil preparation and fertilization. Loosen the soil deeply, enrich it with compost, add garden fertilizer, and provide even moisture. Fall gardens don’t dry out as often as summer ones, but consistent watering is still important initially for germination and growth.
September also marks the time to sow cool-season, reseeding annuals that will bloom next spring. These include old favorites such as bluebonnets, cornflowers, larkspur, and poppies.
Poppies and blue sage
Unlike zinnias and marigolds, which we plant in spring for summer color or again in July for fall color, cool-season annuals need fall planting so their roots can grow and establish through the winter. They germinate, form small rosettes of foliage, and wait patiently until the days lengthen and temperatures rise. Come spring, they explode with flowers.
One of the best examples is larkspur, which has been naturalized in old Texas gardens for generations. The seeds are often broadcast in September, germinate with passing cold fronts, and bloom gloriously in April and May. Texas bluebonnets and poppies work the same way. Seeding them during spring doesn’t work. They need the cool season to develop, which is why scattering seed in September or October is essential.
If you want the best show, prepare the soil by lightly tilling or raking, then scatter seed. You can lightly press it in but to be honest, I never do. Do not bury the seed too deeply. A light watering (or seeding before a rain) will help germination, but after that, nature usually does the rest. I would avoid pre-plant fertilization to help keep the young plants cold hardy during the winter.
In addition to reseeding annuals, September is the ideal time to seed other spring-blooming wildflowers which have the same growth cycle. Nothing captures the Texas spirit like a roadside or meadow bursting with bluebonnets, evening primrose, and Indian paintbrush. But to enjoy that kind of display at home, timing is critical.
Spring blooming wildflower seed needs the cooler soil temperatures of fall to germinate. Once established, they form small plants that sit through the winter before bolting into bloom come spring. Some of the perennial species wait until the second year to bloom. Waiting until spring to sow cool-season, spring blooming wildflowers usually ends in weeds and disappointment.
Spring wildflowers
A successful wildflower planting begins with good soil preparation. Clear existing vegetation (especially exotic invasives), lightly cultivate the soil, and scatter the seed evenly. Mix small seed with sand to make it easier to spread. If you can, rake and press the seed into the soil, but do not cover too deeply. Native wildflowers are adapted to find their own way with rain and sun, but a little irrigation during dry fall spells helps ensure success.
American basketflower, Indian blanket, lanceleaf coreopsis, and pink evening primrose are all good choices for East Texas gardeners. If you want something for summer bloom, consider spring planting black-eyed Susan, Mexican hat, and plains coreopsis. Fall bloomers can be added then as well. A diverse planting ensures blooms over a longer season and provides nectar and pollen for our dwindling pollinators, especially our declining monarch butterflies.
September gardening is more than a ritual. It’s rooted in the rhythms of the seasons. Plants respond to day length, soil temperature, and seasonal rainfall patterns. By aligning our gardening efforts with these natural cues, we’re working with nature instead of against it.
Planting cool-season vegetables and flowers now takes advantage of decreasing insect pressure and milder temperatures. Sowing annuals and wildflowers now mimics the natural life cycle of plants that drop their seed during the summer. By paying attention to timing, we set ourselves up for success without relying on excessive watering, fertilizing, pest control, or expensive fresh grocery store vegetables.
One of the joys of gardening in Texas is that we’re never really finished. There’s always another season just around the corner. September is a month of hope, of fresh starts, of engines revving back to life after the heat stalls us out.
So dust off your tools, pull out your seed packets, and get ready to plant promise. Whether it’s rows of crisp lettuce and carrots, beds of larkspur and poppies, or meadows of bluebonnets and paintbrush, September offers a chance to lay the foundation for a beautiful, bountiful spring.
