Along the upper Gulf Coast, Asian greens belong to fall, winter and early spring. Sowing opens when summer heat breaks and closes as spring warms. Texas spans four USDA zones, so a date that works near Houston is wrong for the Panhandle. Start with your own frost dates, check the soil, and pick fast, disease-resistant types. The dates below describe the Houston area.
When the soil is warm enough in Texas
What is the last spring frost date in Texas?
It depends on where you garden. At Houston’s Bush Intercontinental Airport (station IAH), NOAA’s 1991-2020 Climate Normals put the last 32 F freeze between February 4 and March 1. That is the 30 to 70 percent probability band. Any single year can fall outside it, so treat the window as a guide.
Even inside Houston the date moves. Hobby airport runs about two weeks milder than IAH. Farther north and west the dates change a lot. The Panhandle freezes months earlier in fall and months later in spring. North Texas and the Hill Country each follow their own calendars. The USDA Plant Hardiness Zone Map (2023) runs from zone 6a to zone 10a across the state, so a Houston date is not a statewide planting calendar. Call your county extension office or check a local normals station for your own window.
How warm should the soil be before sowing?
Asian greens wait for the soil, and the soil warms after the frost risk ends. The air can sit at 60 F in the afternoon while the top few inches of a wet bed stay cold. Seed sown into cold, saturated ground sits there and often rots before it sprouts. Plan to start in late winter or early spring only after the last freeze in your area has passed and the bed has drained.
A soil thermometer settles it. Push it into the soil in the morning, when the soil is at its coolest. Brassica seed, which includes most Asian greens, germinates from roughly 45 F upward. It comes up faster and more evenly as the soil climbs through the 50s. If the readings are rising over several mornings and the bed crumbles in your hand instead of smearing, sow.
Spring in Texas is a short window, though. A stretch of cold on young plants followed by warm days can push bok choy and napa types to bolt. Gardeners across the country run into the same problem, and the overview of Asian greens: fast, cold-hardy, and prone to bolting explains why. Where the heat arrives early, as it does on the Gulf Coast, the spring crop is the quick one. The fall crop is the main event.
Texas has no single start date. A grower in the Panhandle waits into spring for the soil, a grower in Houston may sow in February, and both are following the same rule. For fall, the soil problem reverses. Summer-baked beds need to cool before seed will germinate well, which is why shade cloth and a good soaking help in September.
How long the season lasts here
How many frost-free days does the Gulf Coast get?
The Houston reference station has roughly 275 to 318 frost-free days between the mean last spring freeze (February 4 to March 1) and the mean first fall freeze (December 1 to December 19), depending on which ends of the two bands you pair.
That is a long window, and for Asian greens the length matters less than where the good weather sits inside it. The cool part of the year gives the best growing. Midsummer technically counts as frost-free, but it does nothing for a plant that bolts at the first stretch of long, hot days.
What does a long window allow?
It allows a second sowing, and then a third. A short season makes the first sowing the only one. A gardener in a cold climate may get one planting and has to decide carefully whether transplanting is worth the risk to the roots. Along the Gulf, you can sow a small batch every couple of weeks through fall and winter. You get a steady supply of baby leaves, and a bad week of weather costs you one batch instead of the whole bed. The succession sowing guide on this site lays out the spacing between plantings.
Transplants make sense when a bed is occupied or when you want a head start ahead of heat. Check the roots before you buy or pot up. White, spreading roots are healthy. A plant that has been root-bound in its cell for weeks is more likely to bolt after transplanting, because the check to growth acts like a stress signal. Direct sowing sidesteps that, and most leafy Asian greens do well sown in place and thinned.
Gardeners in other humid states face a similar pattern. The guide to growing Asian greens in Louisiana shows how a Gulf-state season plays out. The Maryland guide shows how a cooler Mid-Atlantic one compares, with an earlier fall end and a harder winter. In Texas, the Panhandle looks more like Maryland than like Houston. A grower there may get a single sowing in each of spring and fall, and transplants start to look worth the trouble.
Heat and water in Texas
How hot is too hot for Asian greens?
Summer around Houston is long, hot and humid, and the soil stays warm well into the evening. Asian greens are a cool-season family, so they belong to the second half of the year. Two things govern them: the first fall freeze, which sets how late a sowing can still finish, and the winter low, which decides how the hardiest types handle the cold.
For fall planting, count back from the first freeze. At IAH that falls between December 1 and December 19. Take the days to maturity on the seed packet, which for direct-sown greens count from sowing. Then add extra time, because growth slows as the days shorten. That date is the latest you can sow and still harvest a full-sized plant. Baby leaves can go in later, since they are picked small.
Summer sowing is where most Texas failures happen. Seed sown in July heat tends to sprout poorly and then bolt. A gardener who waits for cooler nights, usually well into September along the Gulf, has far better luck. Afternoon shade from a taller crop or a shade cloth helps young seedlings. A layer of mulch keeps the root zone cooler and holds moisture.
Water matters as much as heat. Shallow, uneven watering stresses the plants and invites bitterness and early bolting. Water from rain or the hose, applied at the base, whenever the soil begins to dry. Heavy fall downpours are common on the Gulf Coast, so sow in raised or well-drained beds. Wet foliage in warm weather is how fungal leaf spots and downy mildew get going.
Will Asian greens survive a Texas winter?
Along the Gulf, mostly yes. The mean daily minimum of the coldest month at the Houston reference station is 43.7 F. That is mild, and the hardiest types will stand through most winters with little help. Row cover or a cold frame handles the occasional hard freeze. A bed left bare can lose tender leaves in one cold night.
Farther north the story changes. In zone 6a, which includes parts of the Panhandle, the first hard freeze ends tender greens, and only the hardiest survive under a cover. Match your plan to the zone you live in, and to the frost dates for your county.
Which Asian greens suit Texas
Which types handle heat and humidity?
Choose by type, and by what your local conditions demand. A short season favors the earliest, fastest types. A hot one favors types that tolerate heat, given airflow and shade at the root. A humid one makes disease resistance the first thing to look for on the seed packet. The Gulf Coast has all three problems in different months, so the order of priorities shifts with the season.
| Type | Speed | Heat | Cold | Best use in Texas |
|---|---|---|---|---|
| Loose-leaf mustards and mizuna types | Fast | Bolt in long heat | Hardy | Fall through early spring |
| Tatsoi and small bok choy types | Fast | Bolt readily | Fairly hardy | Cool months, baby leaves |
| Gai lan (Chinese broccoli) types | Moderate | Better than most | Fairly hardy | Shoulder seasons |
| Napa and heading types | Slow | Poor | Moderate | Fall only, with a long cool run |
The table compares general types, since a variety within a type can differ. Fast, loose-leaf types suit a short or erratic window, and where spring warms quickly they are the safest spring pick. Heading types need a long, cool stretch and are a poor fit for early heat. Gai lan tolerates warmer weather than most but still struggles in midsummer.
Turnips, rutabagas, mustards, kale and cabbage are all brassicas, and they share pests and diseases. That includes the leaf diseases that thrive in warm, wet weather. A gardener who rotates turnips into a bed that held cabbage has rotated nothing, so keep the whole family on a single rotation plan.
Row cover lets you protect brassicas from the cabbage worms that arrive with warm weather. It also gives light frost protection, so it earns its place twice. Good airflow, spacing and watering at the base do more against fungal disease than any treatment, and resistant types do the rest.
Where do I find named varieties for my county?
This guide names no varieties, and for good reason. Texas covers four USDA zones, and a variety that thrives on the coast can fail in the Hill Country or the Panhandle. The only recommendation that means anything is one trialled near you. Texas A&M AgriLife Extension has county offices that publish planting guides and tell you which varieties have performed locally. Call yours before you buy seed.
Common questions
Can I grow Asian greens through a Texas summer?
Most types bolt or struggle in the heat. Gai lan tolerates it better than most, and shade and steady water help. For the best results, sow in the cool part of the year and take a break in midsummer.
When is the last safe date to sow in fall?
Count back from your first fall freeze. At the Houston reference station that falls between December 1 and December 19. Take the days to maturity on the packet (counted from sowing for direct-sown greens), then add extra time for slowing growth. Baby leaves can go in later.
Do I need row cover over winter?
Along the Gulf, the hardiest types often stand through winter without it, since the coldest month’s mean daily minimum is 43.7 F. A hard freeze is a different matter, so keep a cover handy. Farther north, cover is the difference between a harvest and a dead bed.
How do I check turnip roots before storing them?
Inspect each root closely. Feel for soft patches and look for weeping spots or a moldy crown. Any of these ends the question, and the root should go to the compost. A root that looks sound is not guaranteed safe, so do not rely on appearance alone, and do not trust any promised storage length. Use roots promptly and discard anything that seems off.