Troubleshooting
Dilys Cranesbill problems — and how to fix them
Dilys Cranesbill (Geranium 'Dilys') 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.
Geranium sawfly larvae
Small grey-green caterpillars defoliate plants rapidly from late spring; check undersides of leaves from May and remove larvae by hand or apply a suitable insecticide at first sign of damage.
Downy mildew
Yellow patches on the upper leaf surface with grey-purple fungal growth beneath, especially in cool, wet autumns; improve airflow, avoid wetting foliage when watering, and remove affected material promptly.
Prevent dilys cranesbill problems before they start
Most dilys cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Dilys Cranesbill problems — FAQ
Why is my dilys cranesbill geranium sawfly larvae?
Small grey-green caterpillars defoliate plants rapidly from late spring; check undersides of leaves from May and remove larvae by hand or apply a suitable insecticide at first sign of damage.
Why is my dilys cranesbill downy mildew?
Yellow patches on the upper leaf surface with grey-purple fungal growth beneath, especially in cool, wet autumns; improve airflow, avoid wetting foliage when watering, and remove affected material promptly.