Last spring the buds on my peonies swelled up but turned brown and dried up before the flowers emerged. This has never happened before. How can I prevent this?
Botrytis blight is a common fungus disease on peonies. The disease can cause the flower buds to turn brown and fail to open. You may also find purple-black spotting on the leaves and stems. Remove infected buds and leaves as they appear. Fall clean up and a little cooperation from nature (drier spring weather) is usually enough to keep this disease under control.