Lavender in Zone 6B — Pacific Northwest

Lavender is a fantastic addition to any Pacific Northwest garden. Not only does it offer a delightful fragrance and beautiful blooms, but its culinary uses are surprisingly versatile, and it thrives in our mild summers and cool nights. Plus, it's a pollinator magnet!

While our wet springs can be a challenge, and our summers aren't quite as scorching as other regions, Lavender's drought tolerance makes it a great fit. You can absolutely grow it here, especially if you keep our 162-day growing season in mind and provide the right conditions.

Starting Lavender from seed indoors is possible, but be warned – it can be a slow and somewhat frustrating process. It really only makes sense if you want a very specific variety that you can't find as a transplant.

If you're up for the challenge, sow seeds indoors from late February through mid March, giving them about 10 weeks before transplanting. Use seed trays with a good seed-starting mix, and provide consistent bottom watering to avoid damping off. Lavender needs warmth and plenty of light to germinate, so a heat mat and grow lights are helpful, especially with our overcast spring days.

Honestly, for most PNW gardeners, buying Lavender starts from a local nursery is the way to go. You'll get a head start and a much higher success rate. However, if you've started your own, or purchased some online, transplant them outdoors from mid May through early June.

Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. Plant them 12-18 inches apart in a sunny spot with well-draining soil. Be mindful of late spring showers – ensure the soil isn't waterlogged after transplanting.

Lavender is very drought-tolerant, which is perfect for our dry summer months in the Pacific Northwest. Overwatering is a far bigger threat than underwatering in our climate. Focus on providing excellent drainage.

During our wet springs, you likely won't need to water at all. Once the dry summer months arrive, water deeply only when the top 2 inches of soil feel dry to the touch. Usually, a good soak every 1-2 weeks is plenty. Water at the base of the plant to avoid wetting the foliage, which can lead to fungal issues in our sometimes humid conditions.

Signs of underwatering include wilting or drooping leaves, while yellowing leaves often indicate overwatering. A light mulch of gravel around the base of the plant can help improve drainage and prevent soil from staying too wet, which is especially useful during our wet springs.

Regular pruning is key to keeping your Lavender healthy and productive. The main goal is to deadhead spent flowers and maintain a nice shape.

After the first flush of blooms in late summer, prune the flower stems back, shaping the plant into a rounded mound. Aim to cut back about 1/3 of the plant's growth. Crucially, never cut back into the old, woody growth, as Lavender doesn't typically regrow from there. As the first frost approaches around early October, you can do a light cleanup, removing any dead or damaged foliage, but avoid heavy pruning at this time.

Your first Lavender harvest in the Pacific Northwest will likely be from mid August through late September, depending on the variety and the weather that year. Keep an eye on the flower buds – they're ready to harvest when they're deeply colored but not fully open.

Cut the stems long in the morning, after the dew has dried. Harvesting at this stage ensures the highest concentration of essential oils. After harvesting, tie the stems into small bundles and hang them upside down in a cool, dark, and dry place to dry. This not only preserves their fragrance but also allows for continued production throughout the season. As the first frost approaches in early October, harvest any remaining buds, even if they aren't fully open, to salvage what you can.

Here are some common Lavender problems you might encounter in the Pacific Northwest:

Root Rot from Overwatering

• What it looks like: Yellowing leaves, wilting despite moist soil, mushy roots.
• What causes it: Our wet springs and poorly draining soil can lead to waterlogged conditions, which Lavender hates.
• How to fix/prevent it: Improve drainage by adding gravel to the planting hole, planting on a slight mound, and being very careful not to overwater, especially during the rainy season. Choose well-draining soil.

Shab Disease

• What it looks like: Stunted growth, distorted leaves, and a general decline in plant vigor.
• What causes it: This fungal disease thrives in humid conditions.
• How to fix/prevent it: Ensure good air circulation around the plants by spacing them properly. Remove and destroy any affected plant parts. Avoid overhead watering.

Phytophthora

• What it looks like: Rapid wilting, browning leaves, and dark lesions on the stems near the soil line.
• What causes it: This soilborne pathogen is more prevalent in wet conditions.
• How to fix/prevent it: Improve soil drainage and avoid overwatering. Use disease-free plants and consider a fungicide treatment if the problem is severe.

Pacific Northwest Specific Challenges: While our mild summers are generally favorable for Lavender, the combination of wet springs and dry summer humidity can create challenges. Good drainage and careful watering are crucial to prevent root rot and fungal diseases.

Lavender makes a great companion plant for many other herbs and flowers in the Pacific Northwest garden. Rosemary, thyme, and sage all thrive in similar conditions – full sun and well-drained soil – and their aromatic oils can help deter pests. Roses also benefit from Lavender's presence, as it can help repel aphids.

Avoid planting Lavender near mint. Mint is invasive and can quickly crowd out Lavender, stealing valuable nutrients and moisture. Plus, mint prefers slightly moister soil, which is the opposite of what Lavender needs to thrive.