My peonies bloomed decently this year, but now (long after the flowers have
faded), the leaves of all of my plants have a white powder coating them.
Perhaps some sort of mildew? Should I be doing anything special, or just
trim them down to the ground in the fall as I typically do?
It's Powdery mildew. Not much you can do now. cut down but do NOT add to
the compost heap. In the spring when the leaves come out spray with a good
fungicide. Read it's lable before using and follow directions. I'm going
to try "Organicide" next year myself.
You can prevent the buildup of powdery mildew with a formula from the
kitchen. Combine 1 teaspoon of baking soda with a few drops of dishwashing
liquid and add to a gallon of water. Apply weekly.
Probably not enough time left this year to see if it helps. I'd just cut it
down and watch for it next year.
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