Cabbage in Zone 8B — Gulf Coast

Cabbage is a rewarding crop to grow here on the Gulf Coast. Its mild, slightly sweet flavor makes it a versatile addition to everything from slaws and stir-fries to hearty soups and stews. There's real satisfaction in harvesting your own crisp heads of cabbage after nurturing them through our long growing season.

Our high humidity and occasional heavy rains can pose challenges, but with careful timing, you can easily grow beautiful cabbage right here in your backyard. With our 284-day growing season, we have a nice long window of opportunity to get this done.

Here on the Gulf Coast, starting your cabbage indoors is the way to go for a spring harvest. You'll want to get your seeds going indoors from mid-December through early January. This gives them about six weeks to get a head start before transplanting.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist – bottom watering works great to avoid damping off. Place the trays in a warm spot and provide plenty of light, either with a grow light or a sunny windowsill. Since spring comes early here, getting a jump start indoors is key.

Transplant your cabbage seedlings outdoors from early February through early March. Before you plant them in the ground, you'll need to harden them off. This means gradually exposing them to outdoor conditions for about a week to toughen them up.

Space your cabbage plants 12-18 inches apart in rows. At that time of year, we can still get some cool snaps, so keep an eye on the forecast and be ready to cover your young plants if a freeze threatens.

Cabbage needs consistent moisture to form those nice, tight heads, but here on the Gulf Coast, we have to be extra careful with watering. Our high humidity means the soil stays moist longer, and overwatering can lead to problems.

During the cooler months, when rainfall is often plentiful, check the soil moisture with the "finger test" – stick your finger about 2 inches deep. If it feels dry, it's time to water. Aim for about 1 inch of water per week, including rainfall. As the weather warms up, you may need to water more frequently, but always check the soil first.

Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves and slow growth. Overwatering can cause yellowing leaves and root rot. A layer of mulch will help retain moisture and suppress weeds, but avoid piling it against the stem to prevent rot.

You can expect your first cabbage harvest from mid-April through early June. Cabbage is ready to harvest when the head feels firm and solid when you squeeze it. It should also be close to the full size expected 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 may produce smaller side shoots (cabbage sprouts) for a later harvest.

As our first frost approaches in early December, harvest any remaining heads, even if they're not quite full size. Smaller heads are still delicious in slaws and soups.

Here are some common problems you might encounter growing cabbage on the Gulf Coast:

• Cabbage Worms
• What it looks like: Smooth green caterpillars munching on your cabbage leaves, leaving irregular holes and dark green droppings behind. You might also see white butterflies fluttering around.
• What causes it: These are the larvae of those white cabbage butterflies. We can have multiple generations of these pests during our long, warm growing season.
• How to fix/prevent it: Bt spray (Bacillus thuringiensis) is very effective. Floating row covers will keep the butterflies from laying eggs on your plants. You can also handpick the caterpillars. Interplanting with aromatic herbs like thyme and sage can help deter them.
• Cabbage Loopers
• What it looks like: Similar to cabbage worms, but these caterpillars move in a looping motion. They also chew holes in leaves.
• What causes it: Another type of caterpillar that thrives in our warm climate.
• How to fix/prevent it: Bt spray works well on these, too. Handpicking is also an option. Encourage beneficial insects like parasitic wasps that prey on loopers.
• Splitting
• What it looks like: The cabbage head cracks open.
• What causes it: Inconsistent watering. A sudden heavy watering after a dry spell causes the head to swell too quickly and split.
• How to fix/prevent it: Water regularly and consistently. Mulch to help retain moisture. Harvest heads as soon as they are mature to prevent them from splitting.
• Clubroot
• What it looks like: Stunted growth, wilting in the afternoon, and yellowing leaves. When you dig up the plant, you'll see swollen, distorted, club-shaped roots.
• What causes it: A soil-borne pathogen that can persist in the soil for many years. It favors acidic, wet soil.
• How to fix/prevent it: Raise the soil pH to 7.0-7.2 with lime. Improve drainage. Rotate your brassicas on a 7-year cycle. Remove and destroy infected plants (don't compost them). Start your transplants in a sterile mix.

Gulf Coast Specific Challenges: Our hot, humid climate and frequent rainfall create ideal conditions for fungal diseases and pests. Good air circulation and careful watering practices are essential. Be vigilant about checking your plants regularly and addressing problems early.

Companion planting can really help your cabbage thrive. Green beans are a great companion because they fix nitrogen in the soil, which cabbage loves. Celery also works well, as its scent deters cabbage moths. Onions help repel various pests, while potatoes don't compete for the same nutrients. Dill attracts beneficial insects that prey on cabbage pests.

Avoid planting cabbage near tomatoes, strawberries, or peppers. Tomatoes and strawberries can stunt the growth of cabbage, while peppers can attract similar pests. Give your cabbage the best start by choosing the right companions.