'Hillary' Itoh Hybrid Peony blooms for an extended period in May and June. The semi-double flowers are large and showy, in shades of creamy pink and copper. Paeonia Itoh 'Hillary' is an intersectional hybrid between herbaceous and tree peonies, and has cleaner, more disease resistant foliage than either of the parent plants. Introduced in 1999 by the renowned Itoh Peony hybridizer, Roger Anderson. 'Hillary' makes a large, upright vigorous clump, with short wooden stems remaining after leaf drop in fall.