Upright form tree peony blooming in Beijing, China. ...yearly growth has been removed so the majestic woody structure of the plant is clearly visible. | Landscape uses: Tree peonies with upright growth habits make excellent display plants. Do not be intimidated by the height, keep in mind that tree peonies are slow growing plants which take 10-15 years to reach their mature size. Vigorous cultivars can also be kept smaller with yearly pruning. Grow in USDA zones 4-9, with at least 5-6 hrs of…