Collard Greens in Zone 8B — Florida

Collard greens are a Southern staple, and they thrive in our Florida climate, offering a delicious and nutritious harvest when other plants are struggling in the heat. Their slightly bitter, earthy flavor is fantastic braised, sauteed, or added to soups, and the satisfaction of harvesting your own greens during our mild winters is hard to beat.

Florida gardening is a unique beast, with our reversed seasons and challenges like humidity and nematodes. But don't worry! With a little planning and the right timing during our long, 303-day growing season, you can enjoy a bountiful harvest of collard greens.

Starting collard greens indoors isn't essential here in Florida, but it can give you a head start, especially for an earlier spring harvest. If you choose to start indoors, aim for mid January through early February, about four weeks before you plan to transplant.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm (around 70°F) and provide plenty of light, either from a sunny window or a grow light. Remember to water from the bottom to avoid damping off. Given our reversed spring, this can help you get a jump on our warm-season.

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

Space your plants 18-24 inches apart in well-drained soil. Keep an eye on the weather; we sometimes have late cold snaps in February, so be prepared to cover your seedlings if temperatures dip near freezing.

Direct sowing collard greens is a great option in Florida, and it's often the easiest way to go. You can direct sow from early February through mid September, giving you a long window for multiple plantings.

Prepare your soil by loosening it and adding compost or other organic matter. Sow seeds about ½ inch deep and keep the soil consistently moist until they germinate. Thin seedlings to 18-24 inches apart once they have a few true leaves. Direct sowing works well in our sandy soil, but make sure to amend with plenty of organic matter.

Collard greens need consistent moisture to produce tender, flavorful leaves, but overwatering is a real risk in our humid Florida climate. During our drier spring and fall, aim to give your collards about 1 inch of water per week, either through rainfall or irrigation.

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. In the summer, our heavy rainfall can often take care of watering for you, but keep an eye out for dry spells.

Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid environment. Signs of underwatering include wilting leaves and slow growth, while yellowing leaves and root rot can indicate overwatering. Mulching around your plants with pine straw or wood chips helps retain moisture and suppress weeds, a must for our sandy soil.

You can expect your first collard green harvest around mid April if you planted early, and continue harvesting all the way through late December. Collard greens are ready to harvest when the lower leaves are 10-12 inches long.

To harvest, simply cut the outer leaves near the base of the plant, leaving the top rosette intact. This allows the plant to continue producing new leaves for a continuous harvest. The flavor of collard greens actually sweetens after a frost, so don't be afraid to leave them in the garden as long as possible. As our first frost approaches around mid- December, harvest any remaining leaves to enjoy before the cold weather sets in.

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

Cabbage Worms *What it looks like:* Smooth green caterpillars chewing irregular holes in leaves, leaving dark green droppings behind. You might see white butterflies fluttering around. *What causes it:* These are the larvae of white cabbage butterflies, and they can go through multiple generations in our warm climate. *How to fix/prevent it:* Bt spray is very effective. Use floating row covers to prevent butterflies from laying eggs. Handpick caterpillars when you see them. Interplant with aromatic herbs like thyme and sage to deter them.

Aphids *What it looks like:* Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue and curled or distorted new growth. *What causes it:* Rapid-reproducing sap-sucking insects that thrive in warm weather. Ants often "farm" them for their honeydew. *How to fix/prevent it:* A strong spray of water can knock them off. Encourage ladybugs and lacewings, which are natural predators. Insecticidal soap works well for heavy infestations. Avoid over-fertilizing with nitrogen, which attracts them.

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:* Another type of caterpillar that loves brassicas. *How to fix/prevent it:* Same as cabbage worms: Bt spray, handpicking, and row covers.

Downy Mildew *What it looks like:* Yellow patches on the tops of leaves with fuzzy gray-purple growth on the undersides. Leaves turn brown and die from the bottom up. *What causes it:* A fungal pathogen that spreads in cool, humid conditions. *How to fix/prevent it:* Remove affected leaves immediately. Improve air circulation around your plants. Water at the base, never overhead. Copper-based fungicides can help prevent it.

Florida Specific Challenges: Our hot, humid summers and wet-summer rainfall can create ideal conditions for fungal diseases and pest infestations. Choose nematode-resistant varieties if you have nematode problems in your soil. Regular monitoring and prompt action are key to keeping your collard greens healthy and productive.

Companion planting can help your collard greens thrive in Florida's unique environment. Onions and garlic are great companions because their strong scent deters many pests. Beets and potatoes are also good choices as they don't compete for the same nutrients in the soil. Dill attracts beneficial insects like ladybugs and lacewings, which prey on aphids and other pests.

Avoid planting strawberries or tomatoes near your collard greens. Strawberries can attract slugs and snails, which can also damage your collards. Tomatoes are susceptible to similar fungal diseases, increasing the risk of disease spread in our humid climate.