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Tree peony leaves have dark spots

5 years ago

I noticed few days ago a tree peony dark with blotches on its leaves. They just appeared in the last few days. Last fall, it appeared for the first time. I picked the leaves off and discarded them. The other tree peonies don't have anything like this. I thought of spraying the peony with dormant tree spray in the fall, I realize that next years' blooms are dormant and if sprayed they'd be killed. It's just a thought, and I don't know if it would work, or whether it is a proper approach?

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