There are a couple common reasons why peony buds do not open. 1. Not enough sun. In partial to heavy shade, plants are weak and may not be able to supply adequate food to the developing buds. Transplant peonies to a sunny site in September. 2. The flower buds may have been damaged by a late freeze. While the plants themselves can tolerate a light freeze, the buds are more susceptible to cold injury. Unfortunately, little can be done to avoid this problem except be careful to select plants that fit your growing zone.
There are a couple common reasons why peony buds do not open. 1. Not enough sun. In partial to heavy shade, plants are weak and may not be able to supply adequate food to the developing buds. Transplant peonies to a sunny site in September. 2. The flower buds may have been damaged by a late freeze. While the plants themselves can tolerate a light freeze, the buds are more susceptible to cold injury. Unfortunately, little can be done to avoid this problem except be careful to select plants that fit your growing zone.