Bok Choy in Zone 8B — Florida

Bok choy is a fantastic addition to the Florida garden, offering a mild, slightly sweet flavor that's delicious in stir-fries, soups, and salads. Its quick growth and tolerance for light frost make it a reliable crop to grow through our fall and winter months when so many other plants are struggling in the heat.

Sure, Florida gardening has its challenges – humidity, nematodes, and the occasional hurricane – but with careful timing, you can enjoy a bountiful bok choy harvest. Our long, 303-day growing season gives you plenty of opportunity to plant in fall, harvest in winter, and avoid the worst of the summer heat.

Starting bok choy indoors in Florida is an option, but honestly, direct sowing is often easier. If you want to get a jump start, sow seeds indoors from mid January through early February, about four weeks before you plan to transplant. Use seed trays with a good seed-starting mix, provide warmth, and ensure they get plenty of light – a grow light works wonders.

Bottom watering is a great way to keep the soil consistently moist without overwatering. Starting indoors can be useful, especially if we get one of those unexpected temperature swings in early spring.

Transplant your bok choy seedlings outdoors from mid February through late March. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sun and humidity.

Space the seedlings 6-10 inches apart to give them room to grow. Keep an eye on the weather forecast – even though it's getting warmer, we can still have a cold snap, so be prepared to cover your young plants if necessary.

Direct sowing bok choy is a simple and effective method in Florida. Sow seeds directly into the garden from early February through mid October. Ensure the soil is well-drained and rich in organic matter.

Bok choy seeds germinate best in cool soil, so aim for a soil temperature between 55°F and 75°F. Plant seeds about ¼ inch deep and space them 6-10 inches apart. Direct sowing is convenient and avoids transplant shock, but you'll need to monitor closely for pests, especially flea beetles, when the seedlings are small.

Watering is critical for bok choy in Florida, especially given our climate. Aim to keep the soil consistently moist, but not waterlogged. During the cooler months (fall through spring), you'll likely need to water about 1 inch per week, depending on rainfall.

Use the "finger test" – stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. In the summer, when temperatures are high and humidity is oppressive, bok choy is more prone to bolting, so consistent moisture is even more crucial. 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 stunted growth. Overwatering can lead to root rot, so watch for yellowing leaves and a generally unhealthy appearance. A good layer of mulch, like pine straw or wood chips, will help retain moisture and keep the soil cool.

You can expect your first bok choy harvest in Florida from mid March through late December, about 45 days after planting. Harvest baby bok choy when the leaves are 6-8 inches tall, or wait for the full-size heads to reach 12-15 inches. The leaves should be crisp and green.

To harvest, cut the plant above the base, leaving the roots intact. This encourages regrowth, giving you a continuous harvest. As our first frost approaches in mid- December, harvest any remaining bok choy, even if it's small. It's better to harvest early than lose your crop to a freeze.

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

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in the leaves, especially on young seedlings. You might see small, dark beetles jumping when disturbed.
• What causes it: Small jumping beetles that feed on the leaves. They're most damaging to small, young plants.
• How to fix/prevent it: Use row covers to protect seedlings. Delay planting until plants are larger and more resilient. Apply kaolin clay coating. Neem oil spray can help. Interplant with basil or catnip. Healthy, vigorous plants can often outgrow the damage.

Cabbage Worms

• What it looks like: Smooth green caterpillars on the leaves. Irregular holes chewed in the leaves. You might also see dark green droppings and white butterflies hovering around your plants.
• What causes it: These are the larvae of white cabbage butterflies. They have multiple generations per season in our warm climate.
• How to fix/prevent it: Bt spray is very effective. Floating row covers can prevent the butterflies from laying eggs. Handpick the caterpillars when you see them. Interplant with aromatic herbs like thyme and sage to deter the butterflies. Encourage parasitic wasps, which prey on the caterpillars.

Slugs

• What it looks like: Irregular holes in the leaves, especially on low-growing plants. Silvery slime trails on the leaves and soil are a dead giveaway. Damage is usually worse at night and in wet weather.
• What causes it: Slugs are gastropods that feed at night in moist conditions. They hide under mulch, boards, and other debris during the day.
• How to fix/prevent it: Use beer traps (shallow dishes of beer sunk into the soil). Iron phosphate bait is pet-safe. Remove any hiding spots. Water in the morning so the soil surface dries out by evening. Copper tape around beds can deter slugs. Diatomaceous earth around plants is also effective.

Bolting in Heat

• What it looks like: The bok choy sends up a flower stalk. The leaves become tough and bitter, and the harvest quality declines.
• What causes it: This happens when the cool-season crop is exposed to extended warm temperatures. Bok choy tends to bolt when days consistently exceed 80°F.
• How to fix/prevent it: Time your plantings for the cooler months (spring and fall). Choose bolt-resistant varieties. Provide shade during warm spells. Mulch to keep the soil cool. Harvest the bok choy before bolting progresses too far.

Florida Specific Challenges: The combination of hot heat, very-high humidity, and our wet-summer rainfall can make growing bok choy tricky. Humidity promotes fungal diseases, so ensure good air circulation. The summer heat will cause bolting, so stick to spring and fall plantings.

Good companions for bok choy in Florida include garlic and onion, which help deter pests. Beets can also be beneficial, as they don't compete for the same nutrients. Lettuce and spinach are good choices for interplanting, as they have similar growing requirements.

Avoid planting bok choy near strawberries or tomatoes. Strawberries can attract slugs, which will then target your bok choy. Tomatoes are heavy feeders and can deplete the soil of nutrients that bok choy needs to thrive.