Lavender in Zone 7B — Mid-Atlantic

Lavender is a fantastic addition to any Mid-Atlantic garden. Its fragrance is wonderful, and you can use it in cooking, crafts, and even homemade cleaning products. Plus, the sight of those purple blooms swaying in the breeze is a pure delight during our humid summers.

Growing lavender here in Zone 7B comes with some challenges. We've got deer pressure and heavy clay soil to contend with. But with our reliable rainfall and a long 214-day growing season, you can absolutely grow healthy, thriving lavender if you get the timing and drainage right.

Starting lavender from seed indoors isn't the easiest route. Lavender can be slow and finicky to germinate. But if you're up for a challenge, start your seeds indoors from late January through mid February. This gives them about 10 weeks to get a head start before transplanting.

Use seed trays with a well-draining seed starting mix. Provide warmth, ideally around 70°F, and plenty of light. Bottom watering can help prevent damping off, which is a common problem with seedlings. Remember, our springs in the Mid-Atlantic are moderate, so a head start indoors can really help lavender get established before summer.

Transplant your lavender seedlings outdoors from mid April through early May. This avoids the risk of any late frosts that we sometimes get. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Space your plants 12-18 inches apart in a sunny spot with well-drained soil. Honestly, buying established starts is usually the more reliable option. They'll be hardier and faster to establish than seedlings. Just be ready for variable spring weather, and keep an eye on the forecast.

Lavender thrives on neglect when it comes to watering. Overwatering is a surefire way to kill it, especially with our humid summers and even rainfall. Once established, lavender is very drought-tolerant.

During the first few weeks after transplanting, water regularly to help the plants settle in. After that, let the soil dry out completely between waterings. Use the finger test: stick your finger about 2 inches into the soil. If it's dry, it's time to water. Typically, mature lavender in the Mid-Atlantic only needs about an inch of water per week, including rainfall. It's best to water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid conditions.

Signs of underwatering include wilting or drooping leaves. Overwatering can cause yellowing leaves and, eventually, root rot. Mulching with gravel or small stones can help improve drainage and reduce moisture around the base of the plant.

Pruning is important for keeping your lavender plants healthy and productive. After flowering, deadhead the spent blooms and prune the plant into a nice, rounded mound. Cut back about one-third of the growth, but never cut into the old, woody stems. Lavender doesn't regrow well from old wood.

Pruning after the main bloom in summer encourages a second flush of flowers. In the late fall, after the first frost around early November, you can do a light trim to remove any dead or damaged growth. This prepares the plant for winter without overly stressing it.

You can expect your first lavender harvest from mid July through late August, about 90 days after transplanting. The best time to harvest is when the flower buds are showing color but haven't fully opened yet. This is when the essential oils are most concentrated.

Cut the long stems in the morning, after the dew has dried. Use sharp scissors or pruning shears to avoid damaging the plant. Gather the stems into small bundles and hang them upside down in a cool, dark, and dry place to dry. Harvesting regularly encourages the plant to produce more flowers throughout the season. Even as the first frost approaches in early November, you can still harvest any remaining flowers for drying.

Lavender, while relatively easy to grow, can face a few problems in the Mid-Atlantic:

Root Rot from Overwatering

• What it looks like: Yellowing leaves, wilting even when the soil is moist, and a general decline in the plant's health.
• What causes it: Soggy soil and poor drainage. Our humid summers and even rainfall can exacerbate this issue if the soil doesn't drain well.
• How to fix/prevent it: Ensure excellent drainage by planting in raised beds or amending heavy clay soil with plenty of organic matter. Water sparingly and avoid overhead watering.

Shab Disease

• What it looks like: Brown or black spots on the leaves and stems, often accompanied by a general decline in the plant's vigor.
• What causes it: A fungal disease that thrives in humid conditions.
• How to fix/prevent it: Provide good air circulation by spacing plants adequately and pruning regularly. Remove and destroy any affected plant parts. Consider using a fungicide if the problem is severe.

Phytophthora

• What it looks like: Sudden wilting and death of the plant, often with a dark brown or black discoloration at the base of the stem.
• What causes it: A soilborne pathogen that attacks the roots, especially in wet conditions.
• How to fix/prevent it: Ensure excellent drainage and avoid overwatering. Use disease-free plants and avoid planting in areas where Phytophthora has been a problem in the past.

Mid-Atlantic Specific Challenges: The moderate-to-hot summers, high humidity, and even rainfall of the Mid-Atlantic create a challenging environment for lavender. Good drainage is absolutely essential to prevent root rot and fungal diseases. Choose a sunny location with well-drained soil, and be mindful of watering to keep your lavender healthy and thriving.

Lavender benefits from being planted near other Mediterranean herbs. Rosemary, thyme, and sage make excellent companions. They all prefer similar growing conditions: full sun and well-drained soil. Roses also pair well with lavender, as they both enjoy sunny locations and the lavender can help deter pests that might bother the roses.

Avoid planting lavender near mint. Mint is invasive and can quickly take over a garden bed. It also prefers moist soil, which is the opposite of what lavender needs.