Cabbage in Zone 8A — Southeast

Cabbage is a rewarding crop for the Southeast garden, offering fresh, crisp heads perfect for slaws, braising, or adding to soups. Its mild, sweet flavor is especially delicious when you've grown it yourself. Plus, a homegrown cabbage just tastes better!

Our long growing season here in the Southeast means we can squeeze in both a spring and fall crop. While we do have to contend with the humidity and occasional pests, proper timing and a few simple strategies will help you grow beautiful cabbages. With our 245-day growing season, cabbage is definitely within reach.

To get a jump start on the season, start your cabbage seeds indoors from mid-January through early February. This gives you about six weeks to get those seedlings strong before transplanting. Use seed trays with a good seed-starting mix, and keep them in a warm spot, ideally around 70°F.

Consistent moisture is key, so water gently from the bottom to avoid damping-off. This is especially important in our humid climate where fungal diseases can take hold quickly. A simple setup with grow lights will ensure your seedlings get enough light, especially during those still-short winter days.

Transplant your cabbage seedlings outdoors in early to late March. Before planting, harden them off for about a week by gradually exposing them to outdoor conditions. This helps them adjust to the temperature swings and sunlight.

Space your plants 12-18 inches apart to give them room to grow into full heads. Keep an eye on the weather forecast around transplant time, as we can still get some cool snaps. If a late frost is predicted, cover your seedlings with frost blankets.

Cabbage needs consistent moisture to form solid, healthy heads, but overwatering in our humid climate can lead to problems. Check the soil moisture by sticking your finger about 2 inches deep. If it feels dry, it's time to water.

During the hotter months, aim for about 1-1.5 inches of water per week, either from rainfall or irrigation. Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid air. Signs of underwatering include wilting leaves, while yellowing leaves can indicate overwatering.

A good layer of mulch, like pine straw or shredded leaves, helps retain moisture and suppress weeds. Just be sure to keep the mulch a few inches away from the base of the plant to prevent rot, which is a real concern with our humidity.

Your first cabbage harvest should be ready from early May through late June, about 70 days after transplanting. The key sign of ripeness is a firm, solid head. Gently squeeze the cabbage head – it should feel dense and compact.

To harvest, use a sharp knife to cut the cabbage head at its base. Leave the outer leaves intact, as they can sometimes produce smaller secondary heads. As the first frost approaches in mid- November, harvest any remaining heads, even if they're not quite fully mature. They'll still be delicious!

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

Cabbage Worms *What it looks like:* Smooth green caterpillars chewing irregular holes in the leaves, leaving dark green droppings behind. You might also see white butterflies fluttering around your plants. *What causes it:* These are the larvae of white cabbage butterflies, and they can have multiple generations in our long, warm season. *How to fix/prevent it:* Bt spray is very effective. Floating row covers will prevent the butterflies from laying eggs in the first place. You can also handpick the caterpillars. Interplanting with aromatic herbs like thyme and sage can help deter them, and encourage parasitic wasps that prey on the worms.

Cabbage Loopers *What it looks like:* Similar to cabbage worms, but these caterpillars move with a distinctive looping motion. They also chew holes in leaves and can quickly defoliate your plants. *What causes it:* Cabbage loopers are another type of caterpillar that thrives in warm weather and can be particularly problematic in our long summer. *How to fix/prevent it:* Use Bt spray, handpick the loopers, and consider floating row covers. Consistent monitoring is key to catching them early.

Splitting *What it looks like:* The cabbage head cracks open, often after a period of heavy rain or inconsistent watering. *What causes it:* Splitting is caused by rapid growth after a period of drought. The sudden influx of water causes the head to expand too quickly, leading to cracks. *How to fix/prevent it:* Consistent watering is crucial. Mulch helps maintain even soil moisture. If heavy rain is expected, consider lightly scoring the roots with a spade to slow down water uptake.

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:* Clubroot is a soil-borne disease that thrives in 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. Rotate brassicas on a 7-year cycle. Remove and destroy infected plants (don't compost them). Start your transplants in a sterile mix to avoid introducing the disease.

Southeast Specific Challenges: Our hot, humid summers can exacerbate many of these problems. High humidity promotes fungal diseases, so good air circulation and proper watering techniques are essential. Be vigilant about pest control, as warm temperatures mean pests are active for a longer period.

Good companions for cabbage include green beans, celery, onions, potatoes, and dill. Green beans fix nitrogen in the soil, which benefits cabbage. Celery and onions deter cabbage moths and other pests with their strong scent. Potatoes and dill don't compete for the same nutrients and attract beneficial insects.

Avoid planting cabbage near tomatoes, strawberries, and peppers. Tomatoes and peppers can stunt the growth of cabbage. Strawberries are susceptible to some of the same diseases as cabbage, so planting them nearby can increase the risk of infection.