Troubleshooting
Corrugated Sage problems — and how to fix them
Corrugated Sage (Salvia corrugata) 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.
Powdery mildew
The deeply ridged leaves trap humidity; improve air circulation and avoid overhead watering. Apply a potassium-bicarbonate or sulphur spray at first signs.
Root rot (Pythium / Phytophthora)
Poorly drained soil causes crown and root rot, especially in winter; plant in raised beds or add grit to heavy soils and never allow water to pool at the base.
Prevent corrugated sage problems before they start
Most corrugated sage issues are care-mismatch, not bad luck. Dial in the basics:
Corrugated Sage problems — FAQ
Why is my corrugated sage powdery mildew?
The deeply ridged leaves trap humidity; improve air circulation and avoid overhead watering. Apply a potassium-bicarbonate or sulphur spray at first signs.
Why is my corrugated sage root rot (pythium / phytophthora)?
Poorly drained soil causes crown and root rot, especially in winter; plant in raised beds or add grit to heavy soils and never allow water to pool at the base.