What on earth happened to this healthy peony

Asked July 27, 2016, 5:08 PM EDT

This peony bloomed beautifully and in the last two weeks suddenly I have noticed the strange color of the leaves on about half the bush.

Freeborn County Minnesota peony diseases

1 Response

There are several diseases that affect peonies. I can't tell which one is affecting your plant from a photo but a sample can be sent to the plant disease clinic.
https://pdc.umn.edu/
These resources are useful for figuring out what is wrong with your plant.
http://www.extension.umn.edu/garden/diagnose/plant/annualperennial/peony/leavesspots.html
http://www.extension.umn.edu/garden/yard-garden/flowers/diseases-of-peony/
http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/peony-diseases