Cabbage in Zone 8A — Florida

Cabbage is a rewarding crop to grow in Florida, offering a fresh, slightly sweet flavor that store-bought cabbage just can't match. Plus, it's incredibly versatile – you can use it in everything from slaws and stir-fries to soups and braised dishes. Harvesting your own cabbage during our mild winters is a real treat.

Our Florida gardening calendar is different, and summer is definitely the slow season. But by starting cabbage indoors at the right time and transplanting during our cooler months, you can easily avoid the worst of the humidity and pests. With our 283-day growing season, you'll have plenty of time to enjoy a successful harvest.

To get a head start on your spring cabbage crop, start your seeds indoors from late December through mid January. This gives the seedlings about 6 weeks to develop before transplanting. Use seed trays and a good seed-starting mix.

Keep the trays in a warm spot (around 70°F) and provide plenty of light – a grow light works wonders. A tip I learned from another gardener: bottom watering helps prevent damping off, which can be a problem with our high humidity. Fill a tray with water and let the seed trays sit in it for a few minutes until the soil surface is moist. It is a reversed season, so you are starting indoors for a spring harvest.

Transplant your cabbage seedlings outdoors from mid February through mid March. Before planting, it's important to harden them off. Gradually expose them to outdoor conditions for about a week, increasing the amount of time each day.

When transplanting, space the seedlings 12-18 inches apart. Choose a spot that gets full sun (at least 6-8 hours a day). Even though it's technically spring, we can still have some cool snaps, so be prepared to cover your young plants if temperatures dip unexpectedly.

Cabbage needs consistent moisture to thrive, but overwatering can be just as harmful, especially with our Florida humidity. Aim for about 1 inch of water per week, but adjust based on rainfall. During our drier spring months, you'll likely need to water more frequently.

The finger test is your best friend: stick your finger about 2 inches 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.

In Florida, be especially careful about overwatering during our wet summer months. Signs of underwatering include wilting and stunted growth. Overwatering can lead to yellowing leaves and root rot. A good layer of mulch, like pine straw, helps retain moisture and suppress weeds, but don't pile it up against the stem.

You can expect your first cabbage harvest from late April through early June, 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.

Also, make sure it has reached the full size for the specific variety you are growing. To harvest, simply cut the cabbage head at the base with a sharp knife. As our first frost usually hits around early December, keep an eye on the weather forecast. If a freeze is predicted, harvest any remaining mature heads to prevent damage.

Here are some common cabbage problems we face in Florida gardens:

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: Similar to cabbage worms, but these caterpillars move in a looping motion. They also chew holes in leaves.
• What causes it: Larvae of a different moth species. They thrive in warm, humid conditions.
• How to fix/prevent it: Bt spray also works well on cabbage loopers. Handpicking can be effective for smaller infestations. Encourage beneficial insects like lacewings and ladybugs.

Splitting

• What it looks like: The cabbage head cracks or splits open.
• What causes it: Inconsistent watering. A period of drought followed by heavy watering causes the head to swell too quickly.
• How to fix/prevent it: Maintain consistent soil moisture. Water regularly, especially during dry spells. Mulch helps retain moisture. Harvest mature heads promptly to prevent over-ripening.

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 and wet-summer rainfall create ideal conditions for fungal diseases and pests that love cabbage. Consistent monitoring and preventative measures are key to success. Nematodes can also be a problem in our sandy soil, so look for nematode-resistant varieties.

Companion planting can be a great way to improve your cabbage crop in Florida. Green beans are a good choice because they fix nitrogen in the soil, which cabbage needs. Celery can deter cabbage white butterflies. Onions and dill also repel common cabbage pests. Potatoes are also great companion plants.

Avoid planting cabbage near tomatoes, strawberries, or peppers. These plants compete for nutrients and can attract pests that also affect cabbage. It's all about creating a balanced ecosystem in your garden.