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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comAnything to do while it’s dormant?
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[2] https://www.gardeningknowhow.com/ornamental/flowers/peony/treating-spotted-peony-leaves.htm: https://www.gardeningknowhow.com/ornamental/flowers/peony/treating-spotted-peony-leaves.htm
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1 Comment To "My Peony Has Mildew And Still Present Now In The Winter. Can It Be Cured And What Can"
#1 Comment By GKH_Susan On 11/09/2021 @ 5:24 pm
During the summer you can try horticultural oil as suggested by this article below. Since it is the end of the year, I would remove all the foliage since it is going to die back anyway.
https://www.gardeningknowhow.com/ornamental/flowers/peony/powdery-mildew-peonies.htm [1]
https://www.gardeningknowhow.com/ornamental/flowers/peony/treating-spotted-peony-leaves.htm [2]