Peony Plant

Persistent Powdery Mildew on Peonies

Anonymous added on June 1, 2017 | Answered

I replanted these small peonies plants from a shady area to a sunny area near our house. But for the second summer in a row, they have severe mildew on them. Neem oil did not prevent it. From what I have read, once it starts you can't stop it. What should I do at this point. It is only the end of May. So should I remove the foliage, and burn it? Should I just leave it? Or should I remove the diseased plants and put in new healthy ones? If I put in new ones, is it dangerous to put them in the same area?

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Certified GKH Gardening Expert
Answered on June 1, 2017

This link will help you with more information.

You can look for cultivators that are resistant to Powdery Mildew.

I have this issue with my Bee Balm in my garden and though I could tear them out and replace, I have had luck with spraying them with Neem Oil every 2 weeks from the time they emerge from the soil.

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