Lavender in Zone 10B — Florida

Lavender is absolutely worth growing here in Zone 10B Florida. Its fragrance is heavenly, it's incredibly versatile for crafts and cooking, and there's nothing quite like the satisfaction of harvesting your own fragrant bundles. Even though our Florida gardening calendar is different, and summer is definitely the slow season, lavender can thrive here with a little planning.

We do have our share of challenges, like humidity and fungal diseases, but with a little attention to timing, you can absolutely enjoy lavender in your garden. Our long growing season, practically 360 days, gives you a great window to get it established.

Starting lavender from seed indoors is definitely an option, but honestly, it can be a bit tricky. If you're up for the challenge, start your seeds indoors from early to late November, giving them about 10 weeks before you want to transplant.

Use seed trays with a well-draining seed starting mix. Provide warmth and plenty of light – a grow light works wonders. Bottom watering is your friend here; it helps prevent damping off. Remember, our spring is reversed here in Florida, so you're preparing these seedlings during our cooler months for planting in the new year.

Transplant your lavender seedlings outdoors from mid January through early February. Before you plant, make sure you harden them off by gradually exposing them to the outdoor environment for about a week.

Space your plants 12-18 inches apart in a sunny spot with well-draining soil. Keep an eye on the weather; while it's generally mild this time of year, we can still get some unexpected temperature swings. Honestly, for more reliable results, consider buying established starter plants from a local nursery. They'll be more vigorous and better equipped to handle our conditions.

Watering lavender in Florida requires a delicate touch. These plants are very drought-tolerant and thrive in poor, dry soil. Overwatering and our extreme humidity are their biggest enemies. Excellent drainage is non-negotiable.

During our cooler, drier months (late fall through early spring), water only when the top two inches of soil feel dry to the touch – use the "finger test." You might only need to water once a week, or even less, depending on rainfall. During the hotter, wetter summer months, back off even more. Aim for about half an inch of water per week, if rainfall isn't providing it. Always water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate.

Signs of underwatering include wilting and dry, crispy leaves. Overwatering, on the other hand, can lead to yellowing leaves and, eventually, root rot. A light layer of pine straw mulch can help retain some moisture without suffocating the roots, but be careful not to overdo it in our already humid environment.

Pruning is essential for keeping your lavender plants healthy and productive. The main goal is deadheading – removing spent flower stalks after they finish blooming. This encourages the plant to produce more flowers and keeps it looking tidy.

After the main bloom in late spring or early summer, prune your lavender by about one-third, shaping it into a nice, rounded mound. Be careful never to cut back into the old, woody growth, as it likely won't regrow. As our first frost approaches around late December, give your plants a light tidy-up, removing any dead or damaged growth.

You can expect your first lavender harvest from mid April through late May. The best time to harvest is when the flower buds are showing good color but haven't fully opened yet. This is when the fragrance is most intense.

To harvest, simply cut the long stems in the morning, after the dew has dried. Use sharp pruners to avoid damaging the plant. You can harvest continuously throughout the blooming season, which encourages the plant to produce even more flowers. To dry your lavender, tie the stems into small bundles and hang them upside down in a cool, dark, and well-ventilated place. As our first frost approaches in late December, harvest any remaining flower stems to enjoy indoors.

Lavender can face a few problems here in Florida, mainly due to our humidity and soil conditions. Here are three common issues and how to deal with them:

Root Rot from Overwatering

• What it looks like: Yellowing leaves, wilting, and a general decline in the plant's health. The roots will be brown and mushy.
• What causes it: Overwatering and poorly draining soil. Our heavy summer rains and high humidity exacerbate this issue.
• How to fix/prevent it: Ensure excellent drainage by planting in raised beds or amending the soil with plenty of sand and perlite. Water only when the top two inches of soil are dry. Avoid overhead watering.

Shab Disease

• What it looks like: Stunted growth, yellowing leaves, and black spots on the stems. The plant may eventually die.
• What causes it: A fungal disease that thrives in humid conditions. It's spread by splashing water and infected plant debris.
• How to fix/prevent it: Improve air circulation around the plants by spacing them adequately and pruning regularly. Remove and destroy any infected plant parts. Consider using a fungicide if the problem is severe.

Phytophthora

• What it looks like: Sudden wilting and death of the plant, often starting with the roots. The roots will be dark and water-soaked.
• What causes it: A soilborne pathogen that thrives in wet conditions. It's common in areas with poor drainage.
• How to fix/prevent it: Improve soil drainage by planting in raised beds or containers. Avoid overwatering. Use disease-free plants and soil. There are no effective treatments once the plant is infected.

Florida Specific Challenges: Our hot, humid summers and wet-summer rainfall create the perfect environment for fungal diseases like shab disease and phytophthora. Good air circulation, well-draining soil, and careful watering are essential for keeping your lavender healthy here. Nematodes can also be an issue in our sandy soil; consider using nematode-resistant varieties or amending the soil with organic matter.

Companion planting can help your lavender thrive in the Florida garden. Rosemary, thyme, and sage make excellent companions because they share similar growing requirements – full sun and well-drained soil. They also help deter pests and attract beneficial insects. Roses also make good companions, as they appreciate similar growing conditions and can benefit from lavender's pest-repelling properties.

Avoid planting mint near your lavender. Mint is invasive and can quickly take over, crowding out your lavender and competing for resources. It also prefers moist soil, which is the opposite of what lavender needs.