Ann from Cumming, Ga writes
Heritage G Fungicide is not labeled for use on Hydrangeas or ornamentals. A great product labeled for use on Hydrangeas for Cercospora Leaf Spot is Garden Tech Daconil Fungicide Concentrate. It should be applied to the foliage, early on to point of run off, every 7-14 days until conditions no longer favor disease.
Answer last updated on: 04/13/2018