Troubleshooting
Spike lavender problems — and how to fix them
Spike lavender (Lavandula latifolia) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Root and crown rot
The most common cause of plant death — caused by waterlogged soil or heavy clay. Ensure drainage is sharp; raised beds or gravel mulch can help in wet UK gardens.
Woody, declining plants
Lavandula latifolia becomes unproductively woody after 5–7 years. Cut back by up to one-third in early spring (never into old, leafless wood) to extend lifespan; replace overgrown specimens.
Shab (Phytophthora ramorum / Botrytis)
Grey mould and dieback are favoured by still, humid air. Improve spacing and airflow, remove dead wood promptly, and avoid overhead irrigation.
Prevent spike lavender problems before they start
Most spike lavender issues are care-mismatch, not bad luck. Dial in the basics:
Looking for spike lavender in general rather than its problems? Read the full spike lavender care guide — light, water, soil and feeding.
Spike lavender problems — FAQ
Why is my spike lavender root and crown rot?
The most common cause of plant death — caused by waterlogged soil or heavy clay. Ensure drainage is sharp; raised beds or gravel mulch can help in wet UK gardens.
Why is my spike lavender woody, declining plants?
Lavandula latifolia becomes unproductively woody after 5–7 years. Cut back by up to one-third in early spring (never into old, leafless wood) to extend lifespan; replace overgrown specimens.
Why is my spike lavender shab (phytophthora ramorum / botrytis)?
Grey mould and dieback are favoured by still, humid air. Improve spacing and airflow, remove dead wood promptly, and avoid overhead irrigation.