Collard Greens in Zone 8A — Texas

Collard greens are a Southern staple, and they thrive right here in Texas! Their slightly bitter flavor mellows beautifully with cooking, making them incredibly versatile in everything from soups to stir-fries. Plus, there's nothing quite like the satisfaction of harvesting your own fresh greens, especially when you can get two harvests a year, thanks to our long growing season.

Our Texas weather can be unpredictable, with periods of extreme heat and occasional freezes. But don't worry, with a little planning and attention to timing, you can enjoy a bountiful collard green harvest. Our 260-day growing season gives you plenty of flexibility.

Starting collard greens indoors gives you a head start, especially if you're aiming for that early spring harvest. Begin in late January through mid February, about four weeks before you plan to transplant. This helps you get ahead of the Texas heat.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, and try bottom watering to avoid damping off. Place the trays under grow lights or in a very sunny window. Remember, our early spring can bring some unexpected temperature swings, so indoor growing gives you more control.

Transplant your collard green seedlings outdoors in early March through early April. This avoids the worst of any late freezes. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot with well-draining soil, and space the plants 18-24 inches apart. Keep an eye on the weather forecast around transplant time; those early spring thunderstorms can bring hail. Water thoroughly after transplanting.

Direct sowing is another great option for collard greens in Texas. You can direct sow mid February through late August. This gives you flexibility for both spring and fall crops.

Prepare the soil by loosening it and mixing in some compost. Sow seeds 1/2 inch deep and 18-24 inches apart. Keep the soil consistently moist until the seedlings emerge. Direct sowing is simple, but be prepared to protect young seedlings from pests like cabbage worms.

Collard greens need consistent moisture, especially to produce those tender, delicious leaves we all crave. While they're more heat-tolerant than many brassicas, they still need regular watering in the Texas heat. A good rule of thumb is to water deeply when the top two inches of soil feel dry to the touch – do the finger test!

During the hotter months, you'll likely need to water 1-2 inches per week, depending on rainfall. Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our variable humidity. In spring and fall, you can reduce watering frequency slightly.

Keep an eye out for signs of underwatering, such as wilting leaves, or overwatering, such as yellowing leaves. A layer of mulch, like shredded bark or straw, can help retain moisture in the soil and regulate soil temperature, which is especially helpful during our brutal summers.

You can expect your first collard greens harvest in early May through late November, about 75 days after planting. The best time to harvest is when the lower leaves are 10-12 inches long. They should be a good size but still tender.

To harvest, simply cut or snap off the outer leaves near the base of the plant. Leave the top rosette intact, and the plant will continue to produce new leaves throughout the season. The flavor of collard greens actually sweetens after a light frost, so those late-season harvests can be especially delicious.

As the first frost approaches in mid- November, you can harvest the entire plant if you want to preserve the remaining leaves. Otherwise, protect the plants with row covers if you want to extend the harvest a bit longer.

Collard greens are generally easy to grow, but here are a few common problems you might encounter in Texas:

Cabbage Worms

• What it looks like: Smooth green caterpillars chewing irregular holes in leaves, leaving dark green droppings. You might also see white butterflies fluttering around.
• What causes it: Larvae of white cabbage butterflies. They can have multiple generations during our long, warm growing season.
• How to fix/prevent it: Bt spray is very effective. Use floating row covers to prevent the butterflies from laying eggs. Handpick caterpillars whenever you see them. Interplant with aromatic herbs like thyme and sage. Encourage parasitic wasps.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapidly reproducing sap-sucking insects that thrive in warm weather. Ant colonies may farm them for the honeydew they produce.
• How to fix/prevent it: Strong water spray can knock them off. Encourage ladybugs and lacewings, which are natural predators. Use insecticidal soap for heavy infestations, or neem oil for a systemic approach. Avoid excess nitrogen fertilizer, 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 moth larvae. They also thrive in warm, humid conditions.
• How to fix/prevent it: Same as for cabbage worms: Bt spray, row covers, handpicking.

Downy Mildew

• What it looks like: Yellow patches on leaf tops with fuzzy gray-purple growth on undersides. Leaves brown and die from the bottom up.
• What causes it: A pathogen that spreads in cool, humid conditions via wind-carried spores.
• How to fix/prevent it: Remove affected leaves immediately. Improve air circulation by spacing plants properly. Water at the base, never overhead. Copper-based fungicides can help prevent it.

Texas Specific Challenges: The hot-to-extreme heat and variable humidity in Texas can stress collard greens, making them more susceptible to pests and diseases. Consistent watering is crucial, but avoid overhead watering to prevent fungal issues. Also, watch out for fire ants; they can sometimes build mounds near your plants and disrupt their growth.

Good companions for collard greens include onions and garlic, as their strong scent can deter pests. Beets and potatoes are also good choices, as they don't compete for the same nutrients. Dill attracts beneficial insects that prey on pests like aphids and cabbage worms.

Avoid planting collard greens near strawberries or tomatoes. Strawberries and collards can both be susceptible to similar fungal diseases, and tomatoes can stunt the growth of collards.