I've had a tree peony for about 8 years now. Every winter it suffers die back because, at zone 4, it is really at its northern limit, but it spite of that it usually manages to put out one or two blooms. These blooms, which opened yesterday, were knocked over by the rain so I picked them. Tree peony flowers don't last well in the hot sun so the flowers will actually do better in the house. A shrub with lots of blooms must be really spectacular as the flowers are about 8" across.