Cabbage in Zone 10A — Florida

Cabbage thrives in our Florida winters, offering a crisp, slightly sweet flavor perfect for slaws, stir-fries, and even pickling. The satisfaction of harvesting a dense head of cabbage you've grown yourself, especially when so many gardens are slowing down, is truly rewarding. Plus, it's a versatile vegetable that can be used in countless ways in the kitchen.

While Florida gardening does come with challenges like humidity and sandy soil, growing cabbage during our cooler months allows you to sidestep the worst of the heat and many pest pressures. Our extended growing season, often 355 days, gives you plenty of time to nurture your cabbage from seedling to harvest.

Starting cabbage indoors is the way to go here in Florida for a spring harvest. You'll want to sow your seeds indoors from early to late November, giving them about six weeks to get a head start before transplanting. Remember, our spring is reversed compared to the rest of the country!

Use seed trays or small pots filled with a good quality seed-starting mix. Keep the soil consistently moist, and bottom watering can help prevent damping off. Provide warmth and plenty of light – a grow light works wonders – until the seedlings are ready to move outside.

Transplant your cabbage seedlings outdoors from late December through late January. This timing allows them to mature during our coolest months. Before planting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Space your plants 12-18 inches apart in a sunny spot. Remember our sandy soil drains quickly, so amend the planting area with compost. Keep an eye on the weather, and protect young transplants from unexpected cold snaps, which can happen even here.

Cabbage needs consistent moisture to form those dense heads. While we get plenty of rain during our wet summer months, our winter and spring can be drier, so you'll need to supplement with watering. However, be careful not to overwater.

During the cooler months, aim for about 1 inch of water per week, either from rainfall or irrigation. Use the "finger test" – stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Water at the base of the plants to avoid wetting the leaves, as this can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves, while yellowing leaves can indicate overwatering.

Mulching around your cabbage plants with pine straw or wood chips helps retain moisture in our sandy soil and suppresses weeds. Just be sure to keep the mulch a few inches away from the base of the plant to prevent rot.

You can expect to harvest your cabbage from early March through late April, about 70 days after transplanting. The best way to tell if your cabbage is ready is to gently squeeze the head. If it feels firm and solid, it's ready to harvest.

Also, make sure the head has reached the full size expected for the variety you planted. Use a sharp knife to cut the head off at the base of the plant. Don't worry about a continuous harvest – cabbage produces one head per plant.

As our (typically mild) first frost approaches in late December, any remaining cabbage heads should be harvested. They can tolerate a light frost, but prolonged freezing temperatures can damage them.

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

• Cabbage Worms:
• What it looks like: Smooth green caterpillars chewing holes in leaves, leaving dark green droppings. You might also see white butterflies fluttering around.
• What causes it: These are the larvae of cabbage white butterflies, and they can have multiple generations in our warm climate.
• How to fix/prevent it: Bt spray is very effective. Floating row covers keep butterflies from laying eggs. Handpick caterpillars and encourage parasitic wasps to visit your garden.
• Cabbage Loopers:
• What it looks like: Similar to cabbage worms, but these caterpillars move in a looping fashion. They also chew large holes in leaves.
• What causes it: These are the larvae of cabbage looper moths, and they also thrive in our warm climate.
• How to fix/prevent it: Bt spray works well on these too. Handpicking is also an option. Attract beneficial insects like lacewings and parasitic wasps.
• 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 grow too quickly, resulting in splits.
• How to fix/prevent it: Maintain consistent soil moisture. Mulching helps regulate soil moisture. Harvest heads as soon as they are mature to prevent over-ripening and splitting.
• Clubroot:
• What it looks like: Stunted growth, wilting leaves (especially in the heat), and yellowing foliage. Dig up the plant, and you'll find swollen, distorted roots.
• What causes it: A soil-borne fungus that can persist for years. It's more common in acidic, wet soils.
• How to fix/prevent it: Raise the soil pH to 7.0-7.2 with lime. Improve drainage. Rotate your brassica crops (cabbage, broccoli, cauliflower) on a 7-year cycle. Start transplants in sterile potting mix.

Florida Specific Challenges: Our high humidity and wet-summer rainfall can create ideal conditions for fungal diseases, so make sure to provide good air circulation around your cabbage plants. Watch out for nematodes in our sandy soil; consider using nematode-resistant varieties.

Good companions for cabbage include green beans, celery, onions, potatoes, and dill. Green beans fix nitrogen in the soil, benefiting cabbage. Celery repels cabbage white butterflies. Onions and dill deter pests. Potatoes don't directly benefit the cabbage, but they don't compete for resources and can be grown in close proximity.

Avoid planting cabbage near tomatoes, strawberries, and peppers. Tomatoes and peppers are susceptible to similar pests and diseases, increasing the risk of problems. Strawberries can stunt the growth of cabbage. All of these companions compete for nutrients and space.