The Tree Peony Kinkaku, 'Paeonia', produces a bloom that is full double orange yellow. These satin-like flowers are huge and ruffled and super hardy! The Rare Colorful Imperial Tree Peonies are From Japan - The Finest Quality Available! Every garden needs a tree peony. There was a time, many years ago in ancient China, when the only person who could own a tree peony was the Emperor himself. We're not sure what the penalty was for infringing this law, but it can't have been very pleasant. Fortunately for us, tree peonies are now slightly more available. There are very few plants that can compete with a tree peony in full bloom. A mature plant can have in excess of a hundred flowers and these can be 10" or more across! Japanese tree peonies tend to have less double flowers than their Chinese peers, and the flowers are more open and delicate. Growing only 4-5' tall, these exceptional Tree Peonies are sub-zero hardy and bloom for a lifetime.