I have a peony that failed to flower this year. What could be the cause of this?
Cindy Haynes of Iowa State University of Extension has a helpful list of possible reasons peonies may fail to flower. If there are no buds, it may be due to: not enough sun; recently transplanted; planted too deeply; too much fertilizer; need to be divided (clumps too big); plants immature; premature removal of foliage (in July or August). If they have buds that don’t open, these may be the reasons: late freeze; other extreme weather; fungal diseases; insects; undernourished.