Mustard Greens in Zone 8B — Texas

Mustard greens pack a peppery punch that livens up any dish, and they're surprisingly easy to grow here in Texas. Plus, you can get two harvests – one in the spring and another in the fall – making the most of our long growing season.

Sure, we have our challenges with the Texas heat and unpredictable weather, but mustard greens are pretty resilient. With a little planning and attention to timing, you can enjoy fresh greens from your garden for a good portion of our 273-day growing season.

Starting mustard greens indoors is definitely an option, but honestly, it's usually not necessary here in Texas. Our early springs mean you can get away with direct sowing most of the time. However, if we're expecting a particularly wild temperature swing in early spring, starting indoors gives you a head start.

If you *do* decide to start indoors, aim for mid January through early February, about three weeks before you plan to transplant. Use seed trays with a good seed-starting mix, keep them warm, and make sure they get plenty of light – a simple shop light works great. Don't forget to bottom water your seedlings; it helps prevent damping-off.

Transplanting mustard greens outdoors gives you a jump on the season, especially if you started them indoors to avoid a late freeze. Aim to transplant from mid February through late March.

Before you plant, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. Plant them 6-12 inches apart in well-drained soil. Keep an eye on the weather forecast; those unpredictable freezes can still sneak up on you, so be ready to cover your plants if necessary.

Direct sowing is the easiest way to grow mustard greens in Texas, and you have a pretty wide window to do it: late January through late September. The advantage is you skip the transplanting stress.

Just make sure the soil temperature is at least 45°F. Prepare your soil by loosening it and adding some compost. Sow seeds about ½ inch deep and 6-12 inches apart. Keep the soil consistently moist until they germinate. One thing to consider: direct-sown crops are more vulnerable to those early-season pests like flea beetles, so keep an eye out.

Watering is crucial for mustard greens, especially with our unpredictable Texas rainfall and that brutal summer heat. They need consistent moisture to thrive; letting them dry out stresses them out and makes them bolt (go to seed) faster, plus it makes the leaves spicier.

During the spring and fall, when temperatures are milder, aim for about 1 inch of water per week, either from rainfall or irrigation. In the heat of summer, you might need to increase that to 1.5-2 inches per week. 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 fungal diseases, especially when humidity is high.

Overwatering can be just as bad as underwatering, leading to root rot. Yellowing leaves are a sign of overwatering. Wilting leaves can mean either too much or too little water, so check the soil moisture before you react. A good layer of mulch, like shredded leaves or straw, helps retain moisture and regulate soil temperature. This is especially helpful during those scorching summer months.

You can expect your first harvest of mustard greens around mid March through early December, about 45 days after planting. Keep an eye on the leaves; young, tender leaves have a milder flavor, while larger leaves are spicier.

To harvest, simply snip off the outer leaves with scissors or a knife, leaving the inner leaves to continue growing. This encourages continuous production. Make sure to harvest before the plant starts to flower, as the leaves will become bitter once it bolts.

As the first frost approaches in late November, harvest any remaining leaves you want to use. You can also cover the plants to protect them from a light frost and extend your harvest a little longer.

Even mustard greens can have problems in Texas. Here are a few common ones to watch out for:

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in leaves, especially on young seedlings. You might see small, dark beetles jumping around.
• What causes it: Small jumping beetles that feed on the leaves. They love those young, tender plants.
• How to fix/prevent it: Row covers are your best friend for protecting seedlings. You can also delay planting until the plants are a bit bigger. Kaolin clay and neem oil sprays can help, too. Interplanting with basil or catnip might 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 are also signs.
• What causes it: These sap-sucking insects reproduce rapidly, especially in warm weather. And those fire ants? They might be farming them for the honeydew!
• How to fix/prevent it: A strong blast of water from the hose can knock them off. Encourage ladybugs and lacewings – they're natural predators. Insecticidal soap works well for heavy infestations, and neem oil can help systemically. Avoid over-fertilizing with nitrogen, as it attracts them.

Cabbage Worms

• What it looks like: Smooth green caterpillars munching on leaves, leaving irregular holes. You might also see dark green droppings and white butterflies fluttering around.
• What causes it: These are the larvae of those white cabbage butterflies. They can have multiple generations here with our long growing season.
• How to fix/prevent it: Bt spray is very effective. Floating row covers can prevent the butterflies from laying eggs. Handpicking caterpillars is always an option, too. Interplant with aromatic herbs like thyme or sage to confuse the butterflies.

Bolting in Heat

• What it looks like: The plant sends up a flower stalk, and the leaves become tough and bitter.
• What causes it: Extended periods of warm temperatures above 80°F will trigger bolting.
• How to fix/prevent it: Time your plantings for the cooler parts of the year (spring and fall). Choose bolt-resistant varieties if you can find them. Provide shade during those hot spells. Mulch helps keep the soil cool. And, most importantly, harvest frequently before bolting starts.

Texas Specific Challenges: Our hot-to-extreme heat, variable humidity, and unpredictable rainfall can make growing mustard greens a bit tricky. Consistent watering is key to prevent bolting and ensure good flavor. Keep an eye out for pests that thrive in warm weather, and be prepared to protect your plants from sudden temperature swings.

Mustard greens play well with some neighbors in the garden. Onions and garlic are great companions because their strong scent can deter pests. Beets are also a good choice, as they don't compete for the same nutrients. Dill attracts beneficial insects that prey on aphids and other pests. Lettuce provides ground cover, helping to keep the soil cool and moist.

Avoid planting mustard greens near strawberries or tomatoes. Strawberries and mustard greens can compete for resources, while tomatoes are susceptible to some of the same pests and diseases as mustard greens, potentially increasing problems in your garden.