Itoh peonies also known as intersectional hybrid peonies have the characteristics of tree and herbaceous variety; they have huge and colorful flowers like most tree peonies and the perennial growing cycle of herbaceous peonies. They have vigorous growth habits and huge colorful flowers like the tree peonies and the bush will remain green after the flowering cycle. They have woody stems which can support bigger blooms.
I purchased from the Spring Hill Nursery catalog several years ago and finally bloomed this spring. The label is gone so I am not really sure the name of this Itoh peony. It has huge flowers, about 7 inches in diameter with a coral color and large flare in the center. It comes back every spring but has not bloomed since I planted it then dies back in fall. It has several flowers this spring and perhaps will have more next year and the next.
The foliage stays until early fall then cut back when the stems and foliage turn brown.