Bok Choy in Zone 8B — Texas

Bok choy is a fantastic addition to any Texas garden, offering a mild, slightly sweet flavor that's delicious stir-fried, steamed, or added to soups. Plus, its quick growth cycle means you can squeeze in multiple harvests during our long growing season, even with the brutal Texas heat bearing down.

Our unpredictable weather can be a challenge, with everything from late freezes to scorching summers. But with a little planning and attention to timing, you can definitely enjoy fresh, homegrown bok choy thanks to our 273-day growing season.

Starting bok choy indoors in Texas is an option, but honestly, it's often easier to direct sow. However, if you want a head start in the spring, especially after one of our late cold snaps, starting seeds indoors from late January through mid February can be worthwhile. This gives you about 4 weeks to get them going before transplanting.

Use seed trays or small pots filled with a good seed-starting mix, and keep them warm and well-lit. Bottom watering is a great way to keep the soil consistently moist without damping off. Remember, our springs can be early, so don't delay too long!

Transplant your bok choy seedlings outdoors from late February through early April, once the danger of a hard freeze has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space the plants 6-10 inches apart in well-drained soil. Keep an eye on the forecast – we can get some unpredictable weather at this time of year, so be ready to cover them if a late cold snap threatens.

Direct sowing bok choy is a simple and effective method here in Texas, and it's my preferred way! You can direct sow from mid February through late September, giving you a long window for multiple crops.

Make sure the soil is well-prepared and the soil temperature is consistently above 50°F. Sow seeds 1/4 inch deep and space them 6-10 inches apart. This works well because even if it is a little early, we have plenty of warm days to get it going.

Watering is crucial for bok choy in the Texas climate, especially with our unpredictable rainfall and hot-to-extreme summers. Bok choy needs consistent moisture to thrive; drought stress can cause it to bolt quickly.

In the spring and fall, aim for about 1 inch of water per week, either from rainfall or irrigation. During the heat of summer, you may need to increase that to 1.5-2 inches per week. Always check the soil moisture before watering – stick your finger about 2 inches deep; if it feels dry, it's time to water. Watering at the base of the plants is best, but overhead watering is fine, especially when the humidity is low.

Signs of underwatering include wilting leaves and slow growth. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy stem. Mulching around your bok choy plants helps retain moisture and keep the soil cool.

You can expect your first bok choy harvest from late March through early December, depending on when you planted. Bok choy is ready to harvest about 45 days after planting.

Harvest baby bok choy when it's 6-8 inches tall, or wait for the full-size heads to reach 12-15 inches. Cut the plant above the base, leaving the roots intact, and it may regrow for a second harvest. To get the most out of it, harvest often.

As our first frost approaches in late November, harvest any remaining bok choy, even if it's small. It won't survive a hard freeze.

Here are some common problems you might encounter growing bok choy in Texas:

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in leaves. You'll see small dark beetles that jump when disturbed.
• What causes it: Small jumping beetles that feed on leaves, especially on young plants.
• How to fix/prevent it: Use row covers to protect seedlings. Delay planting until plants are larger. Kaolin clay coating can help. Neem oil spray is also effective. Interplant with basil or catnip.

Cabbage Worms

• What it looks like: Smooth green caterpillars on the leaves. Irregular holes chewed in the leaves.
• What causes it: Larvae of white cabbage butterflies. They have multiple generations per season in our warm climate.
• How to fix/prevent it: Bt spray is very effective. Floating row covers prevent the butterflies from laying eggs. You can also handpick the caterpillars.

Slugs

• What it looks like: Irregular holes in leaves, especially on low-growing plants. Look for silvery slime trails on leaves and soil.
• What causes it: Gastropods that feed at night in moist conditions. They hide under mulch and debris during the day.
• How to fix/prevent it: Beer traps can be effective. Iron phosphate bait is pet-safe. Remove hiding spots and water in the morning so the soil surface dries by evening. Diatomaceous earth around plants also helps.

Bolting in Heat

• What it looks like: The bok choy sends up a flower stalk. The leaves become tough and bitter.
• What causes it: Extended warm temperatures above the crop's comfort zone. Bok choy bolts when days consistently exceed 80°F.
• How to fix/prevent it: Time your plantings for the cooler parts of the year (spring and fall). Choose bolt-resistant varieties. Provide shade during warm spells and mulch to keep the soil cool.

Texas Specific Challenges: Our hot-to-extreme heat, variable humidity, and unpredictable rainfall all contribute to the challenges of growing bok choy. The heat can cause bolting, while inconsistent watering can stress the plants and make them more susceptible to pests and diseases. Be vigilant about watering and pest control, and choose your planting times wisely.

Good companions for bok choy in Texas include garlic and onions, as their strong scent can deter pests. Beets also make good neighbors, as they don't compete for the same nutrients. Lettuce and spinach are other great options, as they enjoy similar growing conditions and can provide shade to the bok choy's roots during the Texas heat.

Avoid planting bok choy near strawberries or tomatoes. Strawberries can attract slugs, which can also damage your bok choy. Tomatoes can attract pests that also affect bok choy, increasing the risk of infestation.