Lavender in Zone 6B — Northeast

Lavender is a worthwhile addition to any Northeast garden. Its fragrance alone is a treat, and the flowers are fantastic for crafts, teas, and even culinary uses. Plus, the cool nights we often get here in the summer seem to intensify the fragrance, making it even more rewarding.

Our short growing season and the occasional late spring frost can make warm-weather gardening tricky. But with a little planning, starting your lavender indoors, and choosing the right varieties, you can definitely make the most of our 183-day growing season.

Starting lavender from seed indoors is possible, but honestly, it's a bit of a slow process. If you're patient and want to try it, start your seeds from mid February through early March. That gives you about 10 weeks to get them going before transplanting.

Use seed trays with a well-draining seed-starting mix. Keep the trays warm and provide plenty of light – a grow light is really helpful this far north. Water from the bottom to avoid damping off. It's also important to remember that our spring can be late getting started, so don't rush the process.

Transplanting lavender outdoors should happen from late April through mid May, once the danger of a hard frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Space your lavender plants 12-18 inches apart in a sunny spot. The weather can be unpredictable at this time of year, so keep an eye on the forecast and be prepared to cover your plants if a late frost threatens. Honestly, for reliable results, especially with our short growing season, consider buying established starts from a local nursery.

Lavender is very drought-tolerant, and overwatering is a much bigger problem than underwatering here in the Northeast. Our moderate-to-humid summers and even rainfall mean you need to be very careful not to give it too much water.

During the spring, when the plants are getting established, water them deeply but infrequently. Once established, water only when the top 2 inches of soil are dry to the touch – use the "finger test" to check. In general, established lavender needs less than an inch of water per week, including rainfall.

Water at the base of the plant to avoid getting the foliage wet, which can encourage fungal diseases in our humid climate. Signs of overwatering include yellowing leaves and root rot. Underwatering will cause the leaves to wilt and turn brown. A light mulch of gravel can help improve drainage and keep the soil dry.

Pruning is important for keeping your lavender plants healthy and productive. The key is to deadhead spent flowers and shape the plant after it blooms.

After the flowers fade, cut back the stems by about one-third, shaping the plant into a nice mound. Be careful not to cut into the old wood, as lavender doesn't typically regrow from there. As the first frost approaches around mid- October, stop pruning to allow the plant to harden off for winter.

You can expect your first lavender harvest from late July through early September. This is when the plants are usually in full bloom.

Harvest the flower stems when the buds are showing good color but haven't fully opened yet. Cut the stems long in the morning, after the dew has dried. To dry your lavender, tie the stems into small bundles and hang them upside down in a cool, dark, dry place. Regular harvesting encourages the plant to produce more flowers throughout the season. As the first frost approaches around mid- October, harvest any remaining flowers to dry or use fresh.

Lavender can face a few problems in the Northeast, mainly due to our humidity and sometimes heavy rainfall.

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: Soil that stays too wet for too long. Our even rainfall and moderate-to-humid conditions can make this worse, especially in poorly drained soil.
• How to fix/prevent it: Improve soil drainage by adding sand or gravel. Water only when the top 2 inches of soil are dry. Avoid overwatering, especially during periods of heavy rain.

Shab Disease

• What it looks like: Brown or black spots on the leaves and stems. The plant may look stunted and unhealthy.
• What causes it: A fungal disease that thrives in humid conditions.
• How to fix/prevent it: Provide good air circulation around the plants. Avoid overhead watering. Remove and destroy any affected plant parts.

Phytophthora

• What it looks like: Rapid wilting and death of the plant. The roots may be dark and decayed.
• What causes it: A soilborne pathogen that thrives in wet conditions.
• How to fix/prevent it: Ensure good soil drainage. Avoid overwatering. Use disease-free plants.

Northeast Specific Challenges: Our moderate heat, moderate-to-humid humidity, and even rainfall create conditions that can be challenging for lavender, which prefers dry, sunny climates. Good drainage is essential, and it's important to avoid overwatering.

Lavender has some great companion plants that can thrive in our Northeast gardens. Rosemary, thyme, and sage all share similar growing requirements – full sun and well-drained soil – and they can help repel pests. Roses also make good companions, as they enjoy similar conditions and the lavender can help deter aphids.

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