Cabbage in Zone 7A — Southeast

Cabbage is a versatile and rewarding crop for the Southeast garden. Fresh, homegrown cabbage has a sweetness you just can't find in store-bought heads, and it's perfect for everything from Southern slaw to hearty soups and stews. Plus, there's real satisfaction in harvesting a beautiful, tightly wrapped cabbage head you grew yourself, despite the hot and humid summers.

Our Southeast climate can present challenges like humidity and pests, but with careful timing, you can absolutely grow fantastic cabbage. Our long growing season, about 225 days, gives us a great window for both spring and fall crops. Starting seeds indoors gives you a head start, allowing you to harvest before the worst of the summer heat hits.

Starting cabbage indoors is the way to go for a spring harvest in the Southeast. You'll want to sow your seeds from late January through mid February, about six weeks before you plan to transplant them outside. This gives the seedlings a good head start before our moderate spring arrives.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, and provide warmth with a heat mat if you have one. Bottom watering is an excellent way to prevent damping off; just set the tray in a shallow dish of water and let the soil absorb the moisture. Once the seedlings emerge, make sure they get plenty of light, either from a sunny window or a grow light.

Transplanting your cabbage seedlings outdoors happens from mid March through early April. Before you put them in the ground, you'll need to harden them off. This means gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade, and slowly increase the time and sunlight each day.

When transplanting, space your cabbage plants 12-18 inches apart. Choose a spot that gets full sun, which is at least 6-8 hours of direct sunlight each day. Keep an eye on the weather forecast; those late-season cold snaps can still happen, so be ready to cover your seedlings if a frost is predicted.

Consistent watering is key to growing healthy cabbage in the Southeast. While we often get reliable rainfall, especially during our wet summers, you still need to monitor the soil moisture. Cabbage needs about 1-1.5 inches of water per week, whether that comes from rain or your hose.

Stick your finger about two inches deep into the soil; if it feels dry, it's time to water. Water deeply at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases in our humid climate. During the hottest part of the summer, you might need to water more frequently. Signs of underwatering include wilting leaves, while yellowing leaves could indicate overwatering.

Mulching around your cabbage plants with straw or pine straw helps retain moisture and suppress weeds. Just be sure to leave a little space around the stem to prevent rot. Maintaining consistent moisture is especially important as the heads start to form, as inconsistent watering can cause them to split.

You can expect to harvest your cabbage from mid May through early July, about 70 days after transplanting. The best way to tell if a cabbage head is ready is to give it a gentle squeeze. It should feel firm and solid, not loose or soft. Also, make sure it has reached the full size for the variety you're growing.

To harvest, use a sharp knife to cut the head off at the base of the plant. Leave the outer leaves intact, as they can sometimes produce smaller side shoots that you can harvest later. As our first frost approaches around early November, harvest any remaining heads, even if they aren't quite as large as you'd like. They won't survive a hard freeze.

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

• 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 holes in leaves, often leaving behind only the veins.
• What causes it: Similar to cabbage worms, these are the larvae of a moth. They thrive in warm weather.
• How to fix/prevent it: Bt spray works well. Handpicking can be effective for smaller infestations. Encourage beneficial insects like parasitic wasps.
• Splitting
• What it looks like: The cabbage head cracks open.
• What causes it: Inconsistent watering. Heavy rainfall or irrigation after a dry spell causes the head to grow too quickly, splitting the outer leaves.
• How to fix/prevent it: Maintain consistent soil moisture. Mulch around plants to help retain water. 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 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.

Southeast Specific Challenges: Our hot, humid summers create ideal conditions for fungal diseases and pest infestations on cabbage. Good air circulation, proper watering techniques, and regular monitoring are crucial for success. Japanese beetles can also be a nuisance, so be prepared to handpick them or use appropriate organic controls.

Cabbage benefits from companion planting. Green beans are great companions because they fix nitrogen in the soil, which cabbage needs to thrive. Celery helps deter cabbage white butterflies, reducing cabbage worm infestations. Onions and dill also repel pests. Potatoes can help improve soil structure and aeration, which is beneficial in our often-heavy clay soil.

Avoid planting cabbage near tomatoes, strawberries, or peppers. Tomatoes and peppers compete for nutrients and can attract similar pests. Strawberries can stunt the growth of cabbage.