What is this on the leaves of this plant?
Surrey, United Kingdom
All the plants in one bed have leaves with these marks on. The worst is the Pelargonium, but even tough plants like Heuchera and Hardy Geraniums have been affected. This also happened in early Spring, particularly to the Pelargonium, but the plant recovered. I wanted to take some cuttings, but am not sure if I should if this is a disease.
- 28 Sep, 2009