Lavandula angustifolia 'Munstead' · Shrub
Root rot (Phytophthora): Plant in free-draining soil and avoid overwatering; improve drainage with grit if necessary.
Powdery mildew: Ensure good air circulation by pruning annually and avoid wetting foliage when watering.
Vine weevil: Apply nematodes to the soil in autumn or use biological controls like Steinernema feltiae.
Winter dieback: Avoid pruning in autumn in cold regions and ensure the plant is sited in a sheltered, well-drained spot.
Slugs and snails: Use slug pellets, beer traps, or hand-pick pests at night to protect new growth.