Troubleshooting
Tuberous Cranesbill problems — and how to fix them
Tuberous Cranesbill (Geranium tuberosum) 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.
Tuber rot in summer
Tubers left in waterlogged or moist soil during summer dormancy quickly rot; ensure excellent drainage and a dry position, or lift tubers and store dry in a cool frost-free place.
Geranium sawfly
Greyish-green larvae feed on leaves in spring, leaving ragged holes; check undersides of leaves regularly and remove larvae by hand.
Prevent tuberous cranesbill problems before they start
Most tuberous cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Tuberous Cranesbill problems — FAQ
Why is my tuberous cranesbill tuber rot in summer?
Tubers left in waterlogged or moist soil during summer dormancy quickly rot; ensure excellent drainage and a dry position, or lift tubers and store dry in a cool frost-free place.
Why is my tuberous cranesbill geranium sawfly?
Greyish-green larvae feed on leaves in spring, leaving ragged holes; check undersides of leaves regularly and remove larvae by hand.