Cabbage in Zone 6B — Texas

Cabbage is a rewarding crop for Texas gardeners. Homegrown cabbage has a sweeter, milder flavor than what you find in the stores, and it's incredibly versatile in the kitchen – from slaws to stir-fries. Plus, there's something deeply satisfying about harvesting a big, beautiful head of cabbage that you nurtured from seed.

Our unpredictable weather and the extreme Texas heat can be a challenge, but with careful timing, you can enjoy a great cabbage harvest. Our long, 230-day growing season gives you a chance to plant early and extend your harvest well into the fall.

To get a jump start on the season, start your cabbage seeds indoors from late January through mid February. This gives the seedlings about six weeks to develop before transplanting.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, and provide warmth and plenty of light – a grow light works wonders. Water from the bottom to avoid damping off; set your seed trays in a shallow tray of water and let the soil soak it up.

Starting indoors is crucial here in Texas because our spring can arrive early. This way, you'll have strong seedlings ready to go when the weather cooperates.

Transplant your cabbage seedlings outdoors from mid March through early April. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Texas sun and wind.

Space your cabbage plants 12-18 inches apart in rows. Give them plenty of room to grow into those beautiful heads. Keep an eye on the weather forecast around transplant time; those late-season freezes can still sneak up on you.

Cabbage needs consistent moisture to thrive, but overwatering can be just as detrimental as underwatering, especially with our variable humidity here in Texas. Aim for about 1 inch of water per week, either from rainfall or irrigation.

Stick your finger about 2 inches into the soil near the base of the plant. If it feels dry, it's time to water. Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases, especially when humidity is high.

Signs of underwatering include wilting leaves and slow growth. Overwatering can lead to yellowing leaves and root rot. Mulching around your cabbage plants with straw or shredded leaves helps retain moisture and keeps the soil cooler during the brutal Texas heat.

You can expect to start harvesting your cabbage from mid May through early July, about 70 days after transplanting. The best indicator of ripeness is the firmness of the head.

Give the cabbage head a gentle squeeze. If it feels solid and dense, it's ready to harvest. Cut the head off at the base with a sharp knife, leaving the outer leaves intact.

As our first frost approaches around early November, harvest any remaining cabbage heads, even if they're not quite full size. Smaller heads are still delicious!

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

Cabbage Worms

• What it looks like: Smooth green caterpillars on brassica leaves. Irregular holes chewed in leaves. Dark green droppings. White butterflies hovering around plants.
• What causes it: Larvae of white cabbage butterflies. Multiple generations per season in warm climates.
• How to fix/prevent it: Bt spray is very effective. Floating row covers prevent egg laying. Handpick caterpillars. Interplant with aromatic herbs (thyme, sage). Encourage parasitic wasps.

Cabbage Loopers

• What it looks like: Pale green caterpillars that move in a looping motion. They chew large, irregular holes in leaves, often leaving behind only the veins.
• What causes it: Similar to cabbage worms, cabbage loopers are the larvae of a moth that lays its eggs on brassica plants.
• How to fix/prevent it: Bt spray works well on loopers too. Handpicking is also effective. Encourage beneficial insects like parasitic wasps and lacewings.

Splitting

• What it looks like: The cabbage head cracks open.
• What causes it: Inconsistent watering. Heavy watering after a dry spell causes the head to swell too quickly.
• How to fix/prevent it: Maintain consistent soil moisture. Water regularly, especially during dry periods. Mulching helps regulate soil moisture.

Clubroot

• What it looks like: Stunted growth, wilting in afternoon heat, yellowing leaves. Roots are swollen, distorted, and club-shaped when dug up.
• What causes it: Soil-borne pathogen (Plasmodiophora brassicae) that persists in soil for 10+ years. Favors acidic, wet soil.
• How to fix/prevent it: Raise soil pH to 7.0-7.2 with lime. Improve drainage. Rotate brassicas on a 7-year cycle. Remove and destroy infected plants (don't compost). Start transplants in sterile mix.

Texas Specific Challenges: The extreme Texas heat can stress cabbage plants, making them more susceptible to pests and diseases. Variable humidity and unpredictable rainfall can also lead to splitting. Consistent monitoring and proactive measures are key to success. And watch out for those fire ants when you're working in the garden!

Good companions for cabbage include green beans, celery, onions, potatoes, and dill. Green beans fix nitrogen in the soil, benefiting cabbage growth. Celery and onions deter cabbage moths. Potatoes don't compete for the same nutrients, and dill attracts beneficial insects that prey on cabbage pests.

Avoid planting cabbage near tomatoes, strawberries, or peppers. Tomatoes and peppers can stunt cabbage growth, and strawberries compete for nutrients.