I bought a Shasta daisy about one year ago. It made it through the winter months and reappeared this spring, but with ugly black spots on the leaves. It is the only plant in my garden that has these black spots. What is causing this, and what can I do about it? I am worried about my other perennials.
Certified GKH Gardening Expert
It sounds like a fungus, likely black spot fungus. Treat the plant with neem oil. Here is more information on it: