Rhododendron simsii aka Azalea

Rhododendron simsii, also known as 杜鵑, is a species of rhododendron that is native to East Asia and grows at altitudes of 500-2,700 m (1,600-8,900 ft). The Southern Indian Hybrids, which are evergreen, originated in the Deep South of the U.S. in the mid-19th century and have parentage mainly owed to the Belgian Indian hybrids and other species such as R. indicum and S. simsii. They are hardier than the Belgian Indians and generally have a more open habit, making them the more common group. Plant them in well-drained, acidic soil that is rich in organic matter, and place them in direct light that is less than 1 foot from a window. Though azaleas, including Rhododendron, may have potential pest and disease problems, they are usually trouble-free if planted correctly in proper cultural conditions. As a popular houseplant, Rhododendron requires regular watering to thrive.