QuestionsHow to growTrees and ShrubsPlantinghow to deal with peonies 0 Vote Up Vote Down sandra synnott asked 15 years ago I have two peonies (i think they must be the tree kind) but they have grown far too big for the space they are in – what can I do with them? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Tree peonies can be moved when dormant. Pruning will affect flowering but can also be done in winter or after flowering.