Do peonies get powdery mildew?
Score: 4.3/5 (59 votes) The good news is that powdery mildew on peonies is more of an eyesore than a health problem. However, severe cases of this chalky fungus can weaken the immune system in plants. If this is the case, it's best to remove the foliage now, before the leaves dry and fall to th...