Troubleshooting
Pencilled Cranesbill problems — and how to fix them
Pencilled Cranesbill (Geranium versicolor) 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
Can appear in late summer on dry soils in warm conditions; shear the plant back hard after the main flowering flush to encourage a clean flush of new leaves and often a second round of flowers.
Excessive self-seeding
G. versicolor seeds freely and can naturalise vigorously — remove spent flower stems before seed ripens if this is unwanted in a formal border.
Prevent pencilled cranesbill problems before they start
Most pencilled cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Pencilled Cranesbill problems — FAQ
Why is my pencilled cranesbill powdery mildew?
Can appear in late summer on dry soils in warm conditions; shear the plant back hard after the main flowering flush to encourage a clean flush of new leaves and often a second round of flowers.
Why is my pencilled cranesbill excessive self-seeding?
G. versicolor seeds freely and can naturalise vigorously — remove spent flower stems before seed ripens if this is unwanted in a formal border.