Powdery mildew — an ever present danger in Colorado gardens.
To battle it on a peony I am trying a top coat of a mouthwash solution.
Paeonia ‘Dr Alexander Fleming’
9/4/2016 powdery mildew. 30% solution mouthwash applied to leaves. Trimmed lower leaves.
The mouthwash treatment kept mildew at bay for a couple weeks, but it was best to just cut the plant back to just above the ground.