Tree peonies are all lovely, with a sparse structure of strong stems, clothed in summer with multiply divided leaves. But they come in two kinds: Paeonia delavayi, a Chinese species, is a refined plant, with modest sized flowers, usually bright yellow or the deepest maroon, while Paeonia suffruticosa and P. rockii have huge blousy flowers, often in the case of the hybrids without the slightest hint of good taste. You love them or hate them!

Paeonia ludlowii is a vigorous tree peony with bright green, deeply cut foliage and large, nodding, cup-shaped, bright yellow flowers.