blackened tree peony leaves
I've been nursing three tree peonies along for the last three or four years. Now its fall and they all have what looks like botyris (sp?) rot or powdery mildew on them similar to what my regular peonies tend to get at the end of the season. On my favorite, both the leaves and some of the branches are black. With my regular peonies I just cut the stems to the ground and clean them up. What do I do with my tree peonies? I started cutting off what looked black, and then got worried about cutting off the buds of next years flowers. I am enchanted by the flowers I've seen and now I'm afraid they are already dead, either by pruning or mildew.