Lavender in Zone 9B — Florida

Lavender is a fantastic addition to any Florida garden. Its soothing fragrance, beautiful purple blooms, and culinary uses make it a rewarding plant to grow. Plus, it's a fairly easy-care perennial that can thrive in our sandy soil, adding Mediterranean charm right here in the Sunshine State.

While Florida gardening presents some challenges like high humidity and the occasional hurricane, growing lavender is manageable with careful timing and attention to its specific needs. Our long growing season, nearly year-round, gives you a great opportunity to enjoy this fragrant herb.

While possible, starting lavender from seed indoors isn't the most straightforward approach, especially for beginners. It can be slow and inconsistent. But if you're up for the challenge, start your seeds indoors from mid-November through early December. This gives them about 10 weeks to get a head start before transplanting.

Use seed trays with a well-draining seed-starting mix. Keep the soil consistently moist (bottom watering works well to avoid disturbing the tiny seeds) and provide plenty of light – a grow light is your best bet here in Florida, since our "spring" character is reversed and natural light can be unpredictable. Remember, patience is key!

Transplant your lavender seedlings outdoors in early to late February. This allows them to establish before the intense summer heat arrives. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

When transplanting, space your lavender plants 12-18 inches apart in a sunny location with well-draining soil. Honestly, for more reliable results, consider buying established lavender starts from a local nursery instead of starting from seed. They'll be hardier and more likely to thrive.

Lavender thrives on neglect, especially in Florida's humid climate. Overwatering is a surefire way to kill your lavender plants. Once established, it's very drought-tolerant and prefers poor, dry soil. The key is to mimic its native Mediterranean environment as much as possible.

During our drier fall and winter months, water deeply but infrequently, allowing the soil to dry out completely between waterings. Use the "finger test" – stick your finger about 2 inches deep into the soil. If it's still moist, don't water. Aim for about ½ inch of water per week, if needed, during these cooler months. In the wet summer, you may not need to water at all, unless you are in an extreme drought.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid environment. Signs of overwatering include yellowing leaves and root rot. Underwatering will cause the leaves to wilt and turn brown. A light layer of pine straw mulch can help retain some moisture without suffocating the roots.

Pruning is essential for keeping your lavender plants healthy and productive. The main goal is to encourage bushier growth and more blooms. Deadheading spent flowers is crucial.

After the first flush of blooms in early summer, prune your lavender plants by about one-third, shaping them into a nice mound. Never cut back into the old, woody growth, as lavender rarely regrows from there. After the first frost around late December, give your plants a light tidy-up, removing any dead or damaged growth.

You can expect your first lavender harvest from early May through mid-June. The best time to harvest is in the morning, after the dew has dried, but before the sun gets too intense.

Harvest when the flower buds are plump and show good color but haven't fully opened yet. This is when they have the highest concentration of essential oils. Cut the stems long, leaving several inches of foliage on the plant.

To dry your lavender, gather the stems into small bundles and hang them upside down in a cool, dark, and well-ventilated place. This prevents mold growth, which is a real concern in our humid climate. Continued harvesting throughout the blooming season will encourage more flower production. As the first frost approaches in late December, harvest any remaining flowers to dry and enjoy indoors.

Lavender can face a few challenges in Florida's climate. Here are the most common:

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 and poor drainage create a soggy environment that suffocates the roots and allows fungal pathogens to thrive. This is exacerbated by Florida's high humidity and frequent rainfall.
• How to fix/prevent it: Ensure your lavender is planted in well-draining soil. Water sparingly, only when the top few inches of soil are dry. Improve drainage by amending the soil with sand or perlite. Consider planting in raised beds or containers.

Shab Disease

• What it looks like: Stunted growth, yellowing leaves, and brown or black spots on the stems and foliage.
• What causes it: A fungal disease that thrives in warm, humid conditions. It's often spread by splashing water and infected plant debris.
• How to fix/prevent it: Improve air circulation around your plants by spacing them properly and pruning regularly. Avoid overhead watering. Remove and destroy any infected plant material.

Phytophthora

• What it looks like: Sudden wilting and death of the plant, often starting with the roots and lower stems.
• What causes it: A soilborne water mold that attacks the roots, preventing them from absorbing water and nutrients. It's particularly prevalent in wet, poorly drained soils.
• How to fix/prevent it: Ensure excellent drainage. Avoid overwatering. Use disease-free planting material. Consider using a fungicide specifically labeled for Phytophthora prevention.

Florida Specific Challenges: Our hot heat, very-high humidity, and wet-summer rainfall create the perfect storm for fungal diseases and root rot in lavender. Choosing well-draining soil, providing ample air circulation, and watering judiciously are crucial for success.

Lavender benefits from companion plants that share similar growing requirements and offer mutual benefits. Rosemary, thyme, and sage are excellent companions because they also prefer well-drained soil and full sun. They can even help deter pests that might bother your lavender. Roses also make good companions, as they appreciate similar growing conditions and the lavender can help repel aphids.

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