Lavender in Zone 10A — Florida

Lavender is absolutely worth the effort in Zone 10A. Imagine brushing against the fragrant foliage in your garden, releasing its calming scent. You can use it in cooking, crafts, or just enjoy its beauty – a little bit of Provence in your Florida yard.

Our Florida gardening calendar is different, and summer is the slow season. But by planting in fall and harvesting in spring, you can absolutely grow lavender here. Our 355-day growing season gives you plenty of time, even with our humidity and occasional temperature swings.

Starting lavender from seed indoors gives you a head start, though it can be a bit finicky. Start your seeds indoors from early to late November. This gives them about 10 weeks to get a strong start before our transplant window.

Use seed trays with a well-draining seed starting mix. Bottom watering is key to prevent damping off. Provide warmth and plenty of light, either from a sunny window or a grow light. Remember, our spring character is reversed, so you're starting these as other gardeners are winding down!

Transplant your lavender seedlings outdoors from late January through mid February. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sun and humidity.

Space your plants 12-18 inches apart in a sunny spot with well-draining soil. While our winters are mild, keep an eye out for any unexpected cold snaps, especially right after transplanting. Honestly, for reliable results, consider buying established lavender starts from a local nursery. They're already acclimated to our conditions.

Lavender thrives on neglect, and that's especially important to remember in Florida! Overwatering is a death sentence due to our high humidity. During our drier fall and winter, water only when the top two inches of soil feel dry to the touch – use the finger test!

Even then, a good deep watering of about ½ inch per week is usually plenty. Water at the base of the plant to avoid wetting the foliage, which encourages fungal diseases in our humid climate. During our wet summer, you probably won't need to water at all unless we're in a drought.

Drooping or yellowing leaves can be a sign of overwatering, while crispy, dry leaves indicate underwatering. A light mulch of pebbles or shells can help improve drainage and reduce soil splash, but don't use anything that holds moisture.

Pruning is essential to keep your lavender plants healthy and productive. After the flowers fade, usually in late spring or early summer, deadhead the spent blooms. This encourages more flowering.

Shape the plant into a nice, rounded mound by cutting back about one-third of the growth. Be careful not to cut into the old wood, as lavender doesn't typically regrow from there. As our first frost approaches around late December, you can give your plants a light tidy-up, but avoid heavy pruning at this time.

You can expect your first lavender harvest from late April through early June, about 90 days after transplanting. The best time to harvest is in the morning, after the dew has dried, when the buds are colored but not fully open. This is when the oil content is highest.

Cut the long stems, leaving at least a few inches of green growth on the plant. This encourages continued production throughout the season. To dry your lavender, tie the stems into small bundles and hang them upside down in a cool, dark, and well-ventilated place. As the first frost approaches in late December, harvest any remaining blooms to dry before the cold weather sets in.

Lavender can face a few challenges in our Florida climate. The top three problems are root rot from overwatering, shab disease, and phytophthora.

Root Rot from Overwatering

• What it looks like: Yellowing or wilting leaves, stunted growth, and a mushy, brown root system.
• What causes it: Soggy soil, poor drainage, and our high humidity create the perfect environment for root rot fungi to thrive.
• How to fix/prevent it: Ensure excellent drainage by planting in raised beds or amending your soil with plenty of sand. Water sparingly, and avoid overwatering, especially during the rainy season.

Shab Disease

• What it looks like: Brown or black spots on the leaves and stems, often starting at the base of the plant.
• What causes it: This fungal disease is exacerbated by our humid conditions and poor air circulation.
• How to fix/prevent it: Provide good air circulation by spacing your plants properly and pruning to open up the center of the plant. Remove and destroy any infected plant material immediately.

Phytophthora

• What it looks like: Rapid wilting, yellowing leaves, and dark lesions on the stems near the soil line.
• What causes it: This soilborne pathogen thrives in wet conditions and can quickly kill lavender plants.
• How to fix/prevent it: Improve drainage and avoid overwatering. Use disease-free planting material and consider soil solarization before planting.

Florida Specific Challenges: Our hot, humid summers and sandy soil create a challenging environment for lavender. The humidity encourages fungal diseases, and the sandy soil drains quickly, requiring careful monitoring of watering.

Lavender thrives alongside other Mediterranean herbs that enjoy similar conditions. Rosemary, thyme, and sage make excellent companions, as they also prefer full sun and well-drained soil. Roses also appreciate lavender's company, as it can help deter pests.

Avoid planting lavender near mint, as mint's aggressive growth can quickly overwhelm lavender and compete for resources. Plus, mint prefers moist soil, which is the opposite of what lavender needs to thrive in our Florida climate.