Bok Choy in Zone 10B — Florida

Bok choy is a fantastic addition to your Florida garden, offering a mild, slightly sweet flavor that's delicious stir-fried, steamed, or added to soups. Its crisp texture makes it a refreshing change from the usual greens, and you'll find homegrown bok choy far surpasses anything you can find at the store. Plus, it's incredibly rewarding to harvest your own fresh greens during our mild winters.

Florida gardening is different, and bok choy is definitely a cool-season crop. The secret is timing your planting to avoid the worst of the heat and humidity. With our 360-day growing season, you have ample opportunity to enjoy a bountiful bok choy harvest if you stick to our reversed seasons.

Starting bok choy indoors is an option, but honestly, it's usually not necessary here in Florida. Our mild winters make direct sowing the preferred method for most gardeners. However, if you want a head start, or if we're expecting an unusually cold snap, starting indoors can be beneficial.

If you choose to start indoors, begin in early to late December, about four weeks before you intend to transplant. Use seed trays filled with a good seed-starting mix, provide warmth (a heat mat is helpful), and ensure adequate light with grow lights. Bottom watering will help prevent damping off, which can be a problem in our humid climate.

Transplant your bok choy seedlings outdoors in early January through mid February, once they have a few sets of true leaves. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sunshine and temperature fluctuations.

Plant them 6-10 inches apart in well-draining soil. Keep an eye on the weather forecast; a sudden cold snap can stress young transplants, so be prepared to cover them if needed.

Direct sowing is the easiest way to grow bok choy in Florida. Since our winters are mild, the seeds germinate readily in the soil. The reversed growing season means planting in fall for winter harvest.

Sow seeds late December through early November, directly into well-prepared soil. Ensure the soil temperature is consistently above 50°F for optimal germination. Plant seeds 1/4 to 1/2 inch deep, and thin seedlings to 6-10 inches apart once they emerge.

Bok choy needs consistent moisture to thrive, especially in our sandy Florida soil. Aim to keep the soil consistently moist, but not waterlogged. Bok choy doesn't like to dry out, but extreme humidity can cause fungal issues.

During our drier fall and winter months, you'll likely need to water your bok choy deeply about 1-2 times per week, providing about 1 inch of water each time. Use the finger test – if the top 2 inches of soil feel dry, it's time to water. During our wet-summer months, you might not need to water at all, unless we're experiencing a dry spell.

Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid climate. Overwatering can lead to root rot, while underwatering can cause bolting. A layer of mulch, like pine straw or shredded leaves, can help retain moisture and suppress weeds.

Your bok choy will be ready to harvest in early February through early January, about 45 days after planting. You can harvest baby bok choy when the leaves are 6-8 inches tall, or wait for the full-sized heads to reach 12-15 inches.

To harvest, cut the entire head of bok choy off at the base, leaving about an inch of the stem in the ground. This allows the plant to potentially regrow and produce another smaller harvest. You can also harvest individual outer leaves as needed, extending the harvest period.

As our brief "frost" season approaches in late December, harvest any remaining bok choy, as a hard freeze can damage the leaves. If you have a lot of plants, staggering your planting times will ensure a continuous harvest throughout the cool season.

Here are the most common problems you might encounter growing bok choy in Florida:

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in leaves. You might see small dark beetles that jump when disturbed. Seedlings are especially vulnerable.
• What causes it: These small jumping beetles are most active during warm, dry periods. They love to munch on young brassicas.
• How to fix/prevent it: Use row covers to protect seedlings. Delay planting until plants are larger and more resilient. Kaolin clay coating can deter them. Neem oil can also help. Interplanting with basil or catnip can confuse them.

Cabbage Worms

• What it looks like: Smooth green caterpillars on the leaves, with irregular holes chewed in them. You might also see dark green droppings and white butterflies fluttering around.
• What causes it: These are the larvae of those pretty white cabbage butterflies. They can go through multiple generations in our warm climate.
• How to fix/prevent it: Bt spray is very effective and safe for beneficial insects. Floating row covers will prevent the butterflies from laying eggs. Handpicking the caterpillars is also an option. Interplant with aromatic herbs like thyme or sage to deter the butterflies.

Slugs

• What it looks like: Irregular holes in the leaves, especially on low-growing plants. You'll often see silvery slime trails on the leaves and soil. Damage is usually worse at night and in wet weather.
• What causes it: These gastropods love moist conditions and feed at night. They hide under mulch and debris during the day.
• How to fix/prevent it: Beer traps (shallow dishes of beer sunk into the soil) work well. Iron phosphate bait is pet-safe. Remove any hiding spots like boards or piles of leaves. Water in the morning so the soil surface dries out by evening. Copper tape around your beds can also deter them. Diatomaceous earth around the plants is another option.

Bolting in Heat

• What it looks like: The bok choy sends up a flower stalk, and the leaves become tough and bitter.
• What causes it: Bolting is triggered by extended warm temperatures. Bok choy is a cool-season crop and will bolt when the days consistently exceed 80°F.
• How to fix/prevent it: Time your plantings carefully to avoid the hottest months. Choose bolt-resistant varieties. Provide shade during warm spells. Mulch to keep the soil cool. Harvest promptly before bolting progresses too far.

Florida Specific Challenges: Our high humidity and frequent rainfall can exacerbate fungal diseases in bok choy. Ensure good air circulation around your plants and avoid overhead watering to minimize these issues. Nematodes can also be a problem in our sandy soil; choose nematode-resistant varieties or amend your soil with organic matter to improve its structure and health.

Good companion plants for bok choy in Florida include garlic and onions. Their strong scent can deter pests like aphids and cabbage moths. Beets are also a good choice, as they don't compete for the same nutrients and can help loosen the soil. Lettuce and spinach are compatible because they thrive in similar conditions and don't compete for space.

Avoid planting strawberries or tomatoes near bok choy. Strawberries are susceptible to fungal diseases that can spread to bok choy in our humid climate. Tomatoes are heavy feeders and can deplete the soil of nutrients that bok choy needs to thrive.