Troubleshooting
Interrupted Sage problems — and how to fix them
Interrupted Sage (Salvia interrupta) 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 on leaves
Erysiphe spp. produces white powdery patches on leaves, especially in hot dry days followed by cool humid nights; improve airflow by trimming crowded growth and apply a sulphur-based fungicide or potassium bicarbonate spray at first sign.
Winter wet crown rot
The leading cause of plant loss in UK and northern US gardens; mulch the crown with coarse grit in autumn, ensure the planting site drains freely, and consider lifting pot-grown plants under cover from November to March.
Prevent interrupted sage problems before they start
Most interrupted sage issues are care-mismatch, not bad luck. Dial in the basics:
Interrupted Sage problems — FAQ
Why is my interrupted sage powdery mildew on leaves?
Erysiphe spp. produces white powdery patches on leaves, especially in hot dry days followed by cool humid nights; improve airflow by trimming crowded growth and apply a sulphur-based fungicide or potassium bicarbonate spray at first sign.
Why is my interrupted sage winter wet crown rot?
The leading cause of plant loss in UK and northern US gardens; mulch the crown with coarse grit in autumn, ensure the planting site drains freely, and consider lifting pot-grown plants under cover from November to March.