Peonies forum: Powdery mildew?

Views: 679, Replies: 2 » Jump to the end
Name: Jerry
Salem, IL
Charter ATP Member
Jun 17, 2016 10:08 AM CST
Previously, someone had posted pictures and comments about a gray substance on their peony leaves. This is Roselette in the beginning stage of the same thing. It will completely turn the foliage gray at about the time it turns dormant. Never appears to damage the plant since it comes back better each year. I usually cut Roselette down before the others.
Thumb of 2016-06-17/Oldgardenrose/37d00b

Thumb of 2016-06-17/Oldgardenrose/87e2ca

Name: Jerry
Salem, IL
Charter ATP Member
Jul 22, 2016 2:19 PM CST
This is the same Roselette. The foliage has reached the stage where it no longer provides food for the storage roots. It can be cut down anytime.
Thumb of 2016-07-22/Oldgardenrose/2fa0fc

Thumb of 2016-07-22/Oldgardenrose/fa3deb

Name: Mary Stella
Anchorage, AK (Zone 4b)
Peonies Ponds Dahlias Canning and food preservation Lilies Permaculture
Garden Ideas: Level 2
Aug 1, 2016 8:57 AM CST
I have never gotten it on my peonies but always on my Siberian pea bushes, geraniums (the large blue kind), and the delphs. Pretty unsightly and the Siberian Peas also are afflicted with something that eats the leaves down to sticks similar to the worms that do it to the columbine. But unlike the columbine which I cut to the ground and then come back sans worms, I have lost an entire 10' section of my hedge of SP.

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