Troubleshooting
Long-Leaved Phlomis problems — and how to fix them
Long-Leaved Phlomis (Phlomis longifolia) 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.
Root rot from winter wet
The leading cause of plant loss in UK gardens; waterlogged, cold soils in winter rapidly cause fatal root and crown rot — sharp drainage, a grit mulch, and a sheltered site are the principal preventive measures.
Powdery mildew on foliage
The dense felt of leaf hairs can mask early mildew infections; inspect regularly in humid spells and improve air circulation around the plant, or apply a sulphur-based fungicide as a preventive in susceptible gardens.
Prevent long-leaved phlomis problems before they start
Most long-leaved phlomis issues are care-mismatch, not bad luck. Dial in the basics:
Long-Leaved Phlomis problems — FAQ
Why is my long-leaved phlomis root rot from winter wet?
The leading cause of plant loss in UK gardens; waterlogged, cold soils in winter rapidly cause fatal root and crown rot — sharp drainage, a grit mulch, and a sheltered site are the principal preventive measures.
Why is my long-leaved phlomis powdery mildew on foliage?
The dense felt of leaf hairs can mask early mildew infections; inspect regularly in humid spells and improve air circulation around the plant, or apply a sulphur-based fungicide as a preventive in susceptible gardens.