Cabbage in Zone 8B — Florida

Cabbage is a fantastic crop for Florida gardeners looking for fresh, homegrown goodness during our cooler months. Its crisp texture and mild flavor make it a versatile ingredient in slaws, stir-fries, and soups. Growing your own means enjoying superior taste and the satisfaction of harvesting a beautiful head of cabbage right from your backyard.

While Florida's humidity and sandy soil present unique challenges, the reversed growing season actually works to our advantage with cabbage. By planting in fall, you can avoid the worst of the heat and humidity, and still enjoy a bountiful harvest during our long 303-day growing season.

To get a head start on your spring cabbage crop, start your seeds indoors from mid-December through early January. This gives them about 6 weeks to develop before transplanting. Use seed trays filled with a good seed-starting mix, and keep them in a warm, well-lit area.

Bottom watering is your friend here! Place the tray in a shallow dish of water and let the soil soak it up from the bottom. This prevents damping-off, a common problem in our humid Florida climate. Remember, our spring is really the opposite of up north, so starting early is key.

Transplant your cabbage seedlings outdoors from early February through early March. Before transplanting, be sure to harden them off. This means gradually exposing them to outdoor conditions for about a week, increasing their time outside each day.

Space your plants 12-18 inches apart in a sunny spot with well-drained soil. At this time of year, we can still have occasional cool snaps, so keep an eye on the forecast and be prepared to cover your young plants if a frost is predicted.

Cabbage needs consistent moisture to thrive, but overwatering can be a problem with our high humidity. Aim for about 1 inch of water per week, but adjust based on rainfall. During our drier periods in spring, you'll need to water more frequently.

Use the finger test to check the soil moisture. Stick your finger about 2 inches deep into the soil near the base of the plant. If it feels dry, it's time to water. Always water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases in our humid climate.

Signs of underwatering include wilting leaves, while yellowing leaves can indicate overwatering. A layer of mulch around your cabbage plants helps retain moisture and suppress weeds, which is especially helpful in our sandy Florida soil.

You can expect your first cabbage harvest from mid-April through late May, about 70 days after transplanting. The key is to check the firmness of the head. When you squeeze it gently, it should feel solid and dense.

The head should also be a good size for the variety you're growing. Use a sharp knife to cut the cabbage head at its base, leaving a short stem attached. As our first frosts typically arrive around mid- December, harvest any remaining heads before then to enjoy the fruits (or vegetables!) of your labor.

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

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 our warm Florida climate.
• 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: Similar to cabbage worms, but these caterpillars move in a looping motion. They also chew holes in the leaves and can quickly defoliate a plant.
• What causes it: These are the larvae of a moth. Like cabbage worms, they thrive in our warm climate and can go through multiple generations.
• How to fix/prevent it: Bt spray also works on cabbage loopers. Handpicking is effective for small infestations. Encourage beneficial insects like lacewings and parasitic wasps.

Splitting

• What it looks like: The cabbage head cracks open, often after a period of heavy rain or inconsistent watering.
• What causes it: Rapid changes in soil moisture cause the head to swell too quickly, leading to splitting. This is more common after a dry spell followed by heavy rains, which we often get in Florida.
• How to fix/prevent it: Maintain consistent soil moisture by watering regularly, especially during dry periods. Mulch helps regulate soil moisture. Harvest cabbage heads as soon as they are mature to prevent splitting.

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.

Florida Specific Challenges: Our hot, humid summers mean that cabbage is best grown as a cool-season crop. High humidity also encourages fungal diseases, so ensure good air circulation around your plants and avoid overhead watering. Sandy soil requires consistent watering and fertilization to provide the nutrients cabbage needs. Nematodes can also be a problem, so consider soil solarization or using nematode-resistant varieties.

Companion planting can really help your cabbage thrive here in Florida. Green beans make great companions because they fix nitrogen in the soil, which cabbage loves. Celery can deter cabbage white butterflies, and onions help repel cabbage root flies. Potatoes don't directly benefit the cabbage, but they are a good space filler and 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 peppers are heavy feeders and can compete with cabbage for nutrients. Strawberries can attract slugs and snails, which can also damage cabbage plants.