Lavender in Zone 9A — Texas

Lavender is a fantastic addition to any Texas garden. Its fragrance is heavenly, the flowers are beautiful in arrangements, and you can even use it in cooking! Plus, growing your own lavender and enjoying the beautiful blooms is incredibly rewarding.

The Texas heat and unpredictable weather can be a challenge, but lavender is surprisingly well-suited if you get the timing right. With our long growing season of around 293 days, you have a great window to establish these beauties and enjoy their fragrant blooms.

Starting lavender from seed indoors is possible, but honestly, it can be a bit tricky. Lavender seeds are slow to germinate and the seedlings are delicate. If you're up for a challenge, go for it, but many Texas gardeners find it easier to buy starter plants.

If you want to try starting from seed, begin in mid-December through early January, about 10 weeks before you plan to transplant. Use seed trays with a well-draining seed-starting mix. Keep the soil consistently moist, but not soggy, by watering from the bottom. Provide warmth and plenty of light – a sunny windowsill in our often-early spring-like weather might do, or use grow lights.

Transplant your lavender seedlings outdoors in early to late March. Before you plant, harden them off by gradually exposing them to outdoor conditions for about a week. This will help them adjust to the Texas elements.

Choose a sunny spot with well-drained soil and space the plants 12-18 inches apart. Our weather can be unpredictable at this time, so keep an eye on the forecast for any late freezes. If a freeze is predicted, cover your young plants to protect them. Honestly though, buying established starts from a local nursery is usually the way to go for reliable results.

Lavender is a drought-tolerant plant, so overwatering is a bigger concern than underwatering in Texas. Remember, our summers are hot-to-extreme, and while rainfall can be unpredictable, we often experience periods of drought.

During the hottest part of the summer, you might need to water established lavender plants about once a week, *if* we haven't had any rain. Use the "finger test" – stick your finger about two inches into the soil. If it's dry, it's time to water. When you do water, give them a good soaking, aiming for about an inch of water per week. Water at the base of the plant to avoid getting the foliage wet, which can lead to fungal problems in our variable humidity.

Signs of underwatering include wilting or drooping leaves. Overwatering can cause yellowing leaves and root rot. A light layer of gravel mulch can help improve drainage and prevent the soil from staying too wet.

Pruning is important for keeping your lavender plants healthy and productive. Deadhead spent flowers throughout the growing season to encourage more blooms.

After the first flush of flowers in late spring or early summer, give the plant a more significant pruning. Shape the plant into a nice mound by cutting back about one-third of the growth. Important: Never cut into the old wood, as lavender doesn't typically regrow from there. As winter approaches (first frost around early December), leave the plant alone. Pruning too late in the season can make it more susceptible to cold damage.

You can expect your first lavender harvest in late May through mid-July, depending on the variety and the weather that year. The best time to harvest is when the flower buds are showing good color but haven't fully opened yet.

Cut the stems long in the morning, after the dew has dried. Gather the stems into small bundles and hang them upside down in a cool, dark, and dry place to dry. Regular harvesting encourages the plant to produce more flowers throughout the season. Even as we approach our first frost in early December, you might be able to sneak in one last small harvest if the weather stays mild.

Lavender is generally a low-maintenance plant, but here are a few problems to watch out for in Texas:

Root Rot from Overwatering

• What it looks like: Yellowing leaves, wilting, and a general decline in plant health. The roots will be brown and mushy.
• What causes it: Overwatering or poorly drained soil. Our unpredictable rainfall and occasional flash floods can exacerbate this problem.
• How to fix/prevent it: Ensure your lavender is planted in well-draining soil. Water sparingly, only when the soil is dry to the touch. Avoid planting in areas prone to standing water.

Shab Disease

• What it looks like: Stunted growth, distorted leaves, and grayish-white fungal growth on the plant.
• What causes it: A fungal disease that thrives in humid conditions.
• How to fix/prevent it: Improve air circulation around the plant by spacing them properly and pruning. Remove and destroy any infected plant parts.

Phytophthora

• What it looks like: Sudden wilting, leaf drop, and dark lesions on the stems.
• What causes it: A soilborne pathogen that attacks the roots, especially in wet conditions.
• How to fix/prevent it: Ensure well-draining soil. Avoid overwatering. Remove and destroy infected plants and the surrounding soil.

Texas Specific Challenges: The hot-to-extreme heat, variable humidity, and unpredictable rainfall in Texas can create challenges for growing lavender. The key is to provide excellent drainage, water sparingly, and monitor your plants closely for any signs of stress or disease.

Lavender thrives alongside other Mediterranean herbs that enjoy similar growing conditions. Rosemary, thyme, and sage make excellent companions, as they all prefer full sun and well-drained soil. Roses also pair well with lavender, as they both appreciate similar soil conditions and the lavender can help deter pests.

Avoid planting lavender near mint. Mint is a vigorous grower that can quickly take over and crowd out your lavender. Plus, mint prefers moist soil, which is the opposite of what lavender needs.