||Rhododendron prunifolium has bright red to pink flowers that bloom in late summer, about the same time as the Sweet Azalea but often as late as early fall. Certainly one of the slowest growers of the Rhododendrons with a mature size of 10'High x 10'Wide. The Plum Leaf Azalea is a threatened plant in its native habitat, where it grows beside deep ravines and shady stream banks. It does best in full shade with consistent moisture. The plants that we have currently are a very nice dark form of red, more so than the normal species.