Cabbage in Zone 8B — Southeast

Cabbage is a rewarding crop for the Southeast garden, offering crisp, fresh flavor straight from your backyard. Its versatility in the kitchen—from slaws to stir-fries to roasting—makes it a staple, and there's nothing quite like the satisfaction of harvesting a beautiful, tightly-headed cabbage that you nurtured yourself. Plus, cabbage thrives in our long growing season, giving you ample opportunity for a successful harvest.

Our hot and humid summers can present challenges like fungal disease and pests, but with careful timing, you can easily sidestep the worst of it. The 255-day growing season we enjoy in Zone 8B means you have plenty of time to get your cabbage in the ground and harvested before the heat really cranks up.

To get a jump start on your spring cabbage crop, begin sowing seeds indoors in early to late January. This gives you about 6 weeks to get them strong enough for transplanting. Use seed trays or small pots filled with a good quality seed starting mix.

Keep the soil consistently moist but not soggy. Bottom watering is a great way to prevent damping off. Place the trays in a warm location and provide plenty of light, either with a grow light or a bright, sunny window. Our springs here in the Southeast are generally moderate, so starting indoors gives your cabbage a head start before the warmer weather arrives.

Transplant your cabbage seedlings outdoors in late February through late March, after they've developed several true leaves. Before transplanting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight, wind, and temperature changes.

Space your cabbage plants 12-18 inches apart to allow for adequate growth. When transplanting, keep an eye on the weather forecast. A late cold snap can happen, so be prepared to cover your young plants if temperatures are predicted to drop below freezing.

Cabbage needs consistent moisture to produce those tight, beautiful heads we all want. During our moderate spring months, 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.

Once our hot and humid summer rolls around, your cabbage will need more frequent watering, especially if we're experiencing a dry spell. Aim to water deeply at the base of the plant rather than overhead. Given our humidity, overhead watering can encourage fungal diseases.

Keep an eye out for signs of overwatering, like yellowing leaves, or underwatering, like wilting. Mulching around your cabbage plants with straw or pine straw will help retain moisture in the soil and suppress weeds, which is particularly helpful during our long, hot summers.

You can expect to harvest your cabbage from early May through late June, about 70 days after transplanting. The best way to tell if your cabbage is ready is to give the head a gentle squeeze. It should feel firm and solid.

If the head feels loose or soft, it needs more time. Also, make sure your cabbage has reached its full size for the variety you are growing. To harvest, use a sharp knife to cut the head at its base. Leaving the outer leaves intact can sometimes encourage the plant to produce smaller side shoots.

As our first frost approaches in mid- November, harvest any remaining cabbage heads, even if they aren't quite fully mature. They may not get any bigger, and a hard frost can damage them.

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

Cabbage Worms *What it looks like:* Smooth green caterpillars chewing irregular holes in leaves. You'll also see dark green droppings and white butterflies fluttering around your plants. *What causes it:* These are the larvae of those white cabbage butterflies, and they can go through multiple generations during our long growing season. *How to fix/prevent it:* Bt spray is very effective against cabbage worms. Floating row covers will prevent the butterflies from laying eggs. Handpick caterpillars when you see them and consider interplanting with aromatic herbs like thyme or sage to deter the butterflies.

Cabbage Loopers *What it looks like:* Similar to cabbage worms, cabbage loopers also chew holes in leaves, but they move in a distinctive looping motion. *What causes it:* These are also caterpillars that thrive in our warm climate. *How to fix/prevent it:* Use Bt spray, handpick them, and encourage beneficial insects like parasitic wasps that prey on cabbage loopers.

Splitting *What it looks like:* The cabbage head cracks open. *What causes it:* Inconsistent watering, especially heavy watering after a dry spell. The rapid influx of water causes the head to swell too quickly, leading to splitting. *How to fix/prevent it:* Maintain consistent soil moisture. Mulch around your plants to help retain moisture and avoid letting the soil dry out completely. If a heavy rain is predicted after a dry spell, consider making a shallow cut on the side of the head to relieve pressure.

Clubroot *What it looks like:* Stunted growth, wilting in the afternoon heat, and yellowing leaves. When you dig up the plant, the roots are swollen, distorted, and club-shaped. *What causes it:* A soil-borne pathogen (Plasmodiophora brassicae) that loves acidic, wet soil. It can persist in the soil for many years. *How to fix/prevent it:* Raise the soil pH to 7.0-7.2 with lime. Improve drainage by amending our heavy clay soil with compost and other organic matter. Rotate brassicas on a 7-year cycle. Remove and destroy infected plants (don't compost them!). Start transplants in sterile mix to avoid introducing the pathogen.

Southeast Specific Challenges Our hot, humid summers and wet-summer rainfall create ideal conditions for fungal diseases and pest infestations. Be vigilant about monitoring your plants and taking preventative measures to minimize problems.

Companion planting can give your cabbage a boost in the Southeast garden. Green beans are great companions because they fix nitrogen in the soil, which cabbage loves. Celery can help deter cabbage white butterflies, reducing the risk of cabbage worms. Onions and garlic also deter pests with their strong scent. Potatoes don't directly benefit the cabbage, but they don't compete for the same nutrients, and the act of hilling potatoes can help improve drainage in our clay soil. Dill attracts beneficial insects that prey on cabbage pests.

Avoid planting cabbage near tomatoes, strawberries, or peppers. Tomatoes and peppers can stunt the growth of cabbage, while strawberries compete for the same nutrients in the soil.