Peony Plant

Powdery Mildew on Peonies

radine added on September 7, 2015 | Answered

My peony bushes developed a white powdery substance, which spread like wildfire. I cut them back to the ground, which I usually do in the fall anyway, hoping that I would stop whatever it was. A little Googling reveals that they have powdery mildew. Will cutting them back for the year be enough or do I need to treat the remaining stumps? I live in New Jersey, the plants are in full sun all day.

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Certified GKH Gardening Expert
Answered on September 9, 2015

Treating the pruned plants for the Powdery Mildew is a good idea.
Dispose of the trimmings, do not put in your compost.

Here are some links to help you.

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