Troubleshooting
Clarke's Cranesbill problems — and how to fix them
Clarke's Cranesbill (Geranium clarkei) 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.
Congested clumps losing vigour
Old clumps flower less freely after 3-4 years; lift and divide in spring, replanting the healthy outer portions and discarding the woody centre.
Powdery mildew
Occurs in warm, dry summers especially in sheltered spots; cut the foliage hard back after flowering to promote fresh, mildew-free growth and a second flush of flowers.
Prevent clarke's cranesbill problems before they start
Most clarke's cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Clarke's Cranesbill problems — FAQ
Why is my clarke's cranesbill congested clumps losing vigour?
Old clumps flower less freely after 3-4 years; lift and divide in spring, replanting the healthy outer portions and discarding the woody centre.
Why is my clarke's cranesbill powdery mildew?
Occurs in warm, dry summers especially in sheltered spots; cut the foliage hard back after flowering to promote fresh, mildew-free growth and a second flush of flowers.