I was texting to a friend today about how to cut back her peony plants this fall. She needed a visual, so I sent her this video. Up here in Alaska, Labor Day weekend is traditionally the weekend we all put our beds to sleep. Sometimes in the fall one can feel lazy about fall clean up, but it is very important to at least cut back your peonies and discard all stems and foliage in the garbage. These are not compostable. Peony plants are very susceptible to Botrytis, a nasty fungus that can destroy your blooms. If the foliage is left on the ground over winter, botrytis spores can build up in the garden and create a greater chance of infection next year.