English lavender is a woody perennial herb grown for its fragrant gray-green foliage and purple flower spikes. It attracts bees and other pollinators, tolerates drought once established, and provides flowers usable fresh or dried. It is the most cold-hardy lavender species, making it the reliable choice for Zone 6b.
This plant requires sharp drainage and dislikes wet soil, especially in winter. Plant it in a raised or sloped site with lean, alkaline soil and full sun. Avoid mulching with organic material against the crown, which holds moisture and causes rot. Prune in spring to maintain a compact shape, but never cut into old bare wood, which does not regenerate.
Phytophthora Root Rot
Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.
Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.
Botrytis (grey mould)
Grey fuzzy mould on petals and stems, worst in cool wet conditions.
Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.
Lavender Shab Disease
Shoots wilt and die back individually while the rest of the plant looks healthy. Small dark fungal bodies may appear on infected stems, and dieback spreads over the season.
Prune out and destroy affected stems well below the wilted section, cleaning tools between cuts. Remove severely infected plants. Improve air circulation, avoid overhead watering, and plant in well-draining soil to limit spread.