I have a spot in my flower garden that suffers from some kind of fungal disease, perhaps powdery mildew. In late winter I cut back my scabiosa and coreopsis to the ground, and they start off the season fine. But by mid-summer they start showing signs of disease. The problem is exacerbated by the fact that this small area of the garden is watered by the lawn sprinkler instead of dripline irrigation like the rest of the garden. Is there any way to eliminate fungal disease from an area, or at least give the plants grown here a fighting chance?
-Fleemo