Paeonia suffruticosa (tree peony) is native to China, where it is known as Mudan.
In front of the Audience Hall of Mu Tsung Huang Ti … there were planted thousand-petalled tree-peonies. When the flowers first opened the fragrance of their perfume was perceived by everyone. Each blossom had a thousand petals, large and deeply red. Every time His Majesty gazed upon the sweet-scented luxuriance he would sigh and say, ‘Surely such a flower has never before existed among men!’ (Ninth-Century Chinese Writer)
Science and Civilisation in China: Volume 6: Biology and Biological Technology, Part 1, Botany, by Joseph Needham (Cambridge University Press 1986).
The tree peony is not actually a “tree” but more of a woody-shrub preferring some shade from harsh afternoon noon. The woody stalks produce the next season’s flowers and should be left in tact throughout the winter (unlike herbaceous peonies which die to the ground each season). They are very slow to establish, but well worth the wait. Huge blooms appear in mid-spring (before herbaceous peonies) and the flowers are surrounded by lovely fern-like foliage with a reddish tinge.