Troubleshooting
Grayleaf Cranesbill problems — and how to fix them
Grayleaf Cranesbill (Geranium cinereum) 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 and crown rot
The most serious threat; caused by waterlogged soil, especially in wet UK winters. Plant on a raised alpine bed, surround the crown with a collar of coarse grit, and ensure water drains freely away from the roots at all times.
Vine weevil grubs
The compact root systems of container-grown plants are particularly vulnerable to vine weevil larvae in late summer and autumn; apply Steinernema kraussei nematodes from August to October when soil is above 5°C.
Prevent grayleaf cranesbill problems before they start
Most grayleaf cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Grayleaf Cranesbill problems — FAQ
Why is my grayleaf cranesbill root and crown rot?
The most serious threat; caused by waterlogged soil, especially in wet UK winters. Plant on a raised alpine bed, surround the crown with a collar of coarse grit, and ensure water drains freely away from the roots at all times.
Why is my grayleaf cranesbill vine weevil grubs?
The compact root systems of container-grown plants are particularly vulnerable to vine weevil larvae in late summer and autumn; apply Steinernema kraussei nematodes from August to October when soil is above 5°C.