Please, What CAUSES Powdered Rose Mildew?
What causes powdery mildew on roses? I was told it was due to over watering. Thank you.
Certified GKH Gardening Expert
It's caused by a fungus, which can be brought about by overly wet conditions. This article should be of some help to you: https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm