Collard Greens in Zone 8B — Texas

Collard greens are a Southern staple, and you can absolutely grow them here in Texas! Their slightly bitter, earthy flavor mellows beautifully when cooked, and they're incredibly versatile – braise them, add them to soups, or even use them in salads. Plus, there's real satisfaction in harvesting your own greens, especially when you can get two harvests in our long growing season.

Sure, Texas weather can be a little unpredictable, throwing everything from extreme heat to surprise freezes our way. But with a little planning and attention to timing, you can definitely enjoy a bountiful crop of collard greens. Our 273-day growing season gives you plenty of opportunities to get it right.

Starting collard greens indoors gives you a jump start, especially for a spring harvest. You'll want to get those seeds going late January through mid February, about four weeks before you plan to put them in the ground. This is especially helpful if we get some early warmth and you want to plant early, harvest early.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm (around 70-75°F) and provide plenty of light – a grow light works great. Don't forget to water from the bottom to avoid damping off.

Once your seedlings have a few sets of true leaves, and the weather is cooperating (late February through late March), it's time to transplant them outdoors. Before you do, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Texas sun and wind.

Plant them 18-24 inches apart in well-drained soil. Keep an eye on the forecast – those late freezes can still sneak up on you! If a freeze is predicted, cover your young plants to protect them.

Direct sowing is a great option for collard greens, especially for a fall harvest. You can sow seeds mid February through late August. Just make sure the soil temperature is at least 60°F for good germination.

Prepare the soil by loosening it and adding some compost or other organic matter. Sow seeds about ½ inch deep and 18-24 inches apart. Keep the soil consistently moist until the seedlings emerge. Direct sowing is less work, but it does mean your plants will be exposed to the elements from the start, so be prepared to protect them from pests and extreme weather.

Consistent watering is key to growing tender, delicious collard greens here in Texas. While they're more heat-tolerant than some other brassicas, they still need regular moisture, especially during our hot summers. Aim for consistently moist soil, but never soggy.

During the spring and fall, when temperatures are milder and rainfall is more likely, you'll probably need to water about once a week, giving them around 1 inch of water. In the heat of summer, though, you might need to water every other day, or even daily, to keep them happy. Stick your finger about 2 inches deep into the soil – if it feels dry, it's time to water.

Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our variable humidity. Overwatering can lead to root rot, so make sure your soil drains well. Underwatering will result in tough, bitter leaves. A good layer of mulch around your plants will help retain moisture and keep the soil cool.

You can expect your first harvest of collard greens late April through early December, about 75 days after planting. The best time to harvest is when the lower leaves are about 10-12 inches long.

To harvest, simply snap off the outer leaves, leaving the top rosette intact. This allows the plant to continue producing new leaves throughout the season. 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 the first frost approaches in late November, you can harvest the entire plant if you want, or just keep picking leaves as needed. Even after a light frost, the remaining leaves are usually still good to eat.

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

Cabbage Worms *What it looks like:* You'll see smooth, green caterpillars munching on your leaves, leaving irregular holes and dark green droppings behind. White butterflies fluttering around your plants are a telltale sign. *What causes it:* These are the larvae of those white cabbage butterflies. They can have multiple generations in a single season in our warm climate. *How to fix/prevent it:* Bt spray is very effective at controlling cabbage worms. You can also use floating row covers to prevent the butterflies from laying eggs on your plants. Handpicking caterpillars is another option, and interplanting with aromatic herbs like thyme and sage can help deter them. Encourage parasitic wasps to visit your garden, as they prey on cabbage worms.

Aphids *What it looks like:* Look for clusters of tiny, soft-bodied insects (green, black, or white) on the stems and undersides of leaves. You might also notice a sticky honeydew residue and curled or distorted new growth. *What causes it:* Aphids are sap-sucking insects that reproduce rapidly, especially in warm weather. Ant colonies often "farm" them for their honeydew. *How to fix/prevent it:* A strong spray of water can knock aphids off your plants. Encourage ladybugs and lacewings, which are natural predators. Insecticidal soap can be used for heavy infestations, and neem oil works systemically. Avoid using excess nitrogen fertilizer, as it attracts aphids.

Cabbage Loopers *What it looks like:* Similar to cabbage worms, but these caterpillars move in a looping motion. They chew large holes in leaves, sometimes leaving only the veins. *What causes it:* Cabbage loopers are the larvae of a grayish-brown moth. They thrive in warm weather. *How to fix/prevent it:* Bt spray is effective against cabbage loopers. Handpick them off your plants, and use floating row covers to prevent moths from laying eggs. Encourage natural predators like birds and parasitic wasps.

Downy Mildew *What it looks like:* You'll see yellow patches on the tops of leaves, with fuzzy, gray-purple growth on the undersides. Leaves will eventually brown and die, starting from the bottom of the plant. *What causes it:* Downy mildew is caused by an oomycete pathogen that spreads in cool, humid conditions via wind-carried spores. *How to fix/prevent it:* Remove affected leaves immediately to prevent the spread of the disease. Improve air circulation around your plants by spacing them properly. Water at the base of the plants, avoiding overhead watering. Copper-based fungicides can be used for prevention, and planting resistant varieties is always a good idea.

Texas-Specific Challenges: The combination of hot-to-extreme heat, variable humidity, and unpredictable rainfall in Texas can make growing collard greens a challenge. The heat can stress the plants, making them more susceptible to pests and diseases. High humidity can promote fungal diseases like downy mildew. And unpredictable rainfall can make it difficult to maintain consistent soil moisture. Be diligent about monitoring your plants and adjusting your watering and pest control strategies as needed.

Companion planting can really give your collard greens a boost in the Texas garden. Onions and garlic are great companions because their strong scent can help deter pests like aphids and cabbage moths. Beets are also a good choice, as they don't compete for the same nutrients and can actually improve the soil. Potatoes can provide some shade for your collards during the hottest part of the day, and 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 are susceptible to some of the same fungal diseases as collards, so planting them together can increase the risk of infection. Tomatoes, being heavy feeders, can compete with collards for nutrients in the soil.