Troubleshooting
Druce's Cranesbill problems — and how to fix them
Druce's Cranesbill (Geranium × oxonianum) 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 in late summer
Very common on G. × oxonianum cultivars; shear the whole plant back to 10-15 cm after the main summer flush to remove mildewed foliage and stimulate a clean flush of new leaves and autumn flowers.
Invasive spreading by self-seeding
This hybrid is highly fertile and can self-seed prolifically, sometimes smothering slower-growing neighbours; deadhead regularly or shear over after flowering to limit volunteer seedlings.
Prevent druce's cranesbill problems before they start
Most druce's cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Druce's Cranesbill problems — FAQ
Why is my druce's cranesbill powdery mildew in late summer?
Very common on G. × oxonianum cultivars; shear the whole plant back to 10-15 cm after the main summer flush to remove mildewed foliage and stimulate a clean flush of new leaves and autumn flowers.
Why is my druce's cranesbill invasive spreading by self-seeding?
This hybrid is highly fertile and can self-seed prolifically, sometimes smothering slower-growing neighbours; deadhead regularly or shear over after flowering to limit volunteer seedlings.