R. davidsonianumRhododendron species native to the forests of Sichuan, China, where it lives at altitudes of 5,000 10,000 ft. The plant grows fairly quickly up to 8 12 ft tall and somewhat less wide. The pink flowering display is, as seen in this photo taken at the Rhododendron Species Garden in Washington state, quite impressive with barely any foliage visible. Hardy for zones 7 9.