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I have problems every year with black spot on my peonies, and last year some got a lot of powdery mildew on them. I was told by someone at a local nursery that Neem oil will work for preventing these things, but you have to get it on the plants before it occurs. Is there anything else I can do to prevent these things organically? I have used chemicals in the past, but have come to realize how harmful to the environment these things are, and I have switched to organic methods. Any help on this would be appreciated. The black spot and mildew don't seem to harm the plants at all, but it's very unsightly.
Karen
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