Troubleshooting
Luisier's Lavender problems — and how to fix them
Luisier's Lavender (Lavandula stoechas subsp. luisieri) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Rosemary beetle (Chrysolina americana)
Metallic-striped beetles and their larvae strip foliage, especially in late summer and autumn. Hand-pick adults at dusk or use a pyrethrum-based contact insecticide; damage is rarely fatal but weakens plants.
Grey mould (Botrytis cinerea)
Botrytis causes grey fluffy mould on stems and foliage, typically in wet winters or after autumn pruning in damp conditions. Improve air flow, avoid late pruning, and remove infected material promptly.
Prevent luisier's lavender problems before they start
Most luisier's lavender issues are care-mismatch, not bad luck. Dial in the basics:
Luisier's Lavender problems — FAQ
Why is my luisier's lavender rosemary beetle (chrysolina americana)?
Metallic-striped beetles and their larvae strip foliage, especially in late summer and autumn. Hand-pick adults at dusk or use a pyrethrum-based contact insecticide; damage is rarely fatal but weakens plants.
Why is my luisier's lavender grey mould (botrytis cinerea)?
Botrytis causes grey fluffy mould on stems and foliage, typically in wet winters or after autumn pruning in damp conditions. Improve air flow, avoid late pruning, and remove infected material promptly.