In late spring Big Brown Purple tree peony produces showy reddish-purple double flowers with a purple blotch at the base of each petal.  The flowers are the size of dinner plates. This deciduous shrub needs full sun and moderate moisture conditions to reach a height of about five feet after a number of years. 

Tree peonies dislike transplanting, so gardeners should chose their planting location carefully. Very slow growing, the flower buds are susceptible to late spring frosts. A tree peony in full bloom is a spectacular sight.