One of the few shrub-form Hoyas, H. multiflora can grow up to 8-1/2 feet tall in its native habitat of Southern China, Indo-China, the Indian state of Assam, and Bangladesh.  Popularly known as the "Shooting Star Hoya", it's a vigorous grower, producing lots of clusters of star-shaped flowers at any season of the year, provided it has plenty of bright light.  Like most Hoyas, it prefers to have its soil dry well between waterings, to prevent root rot.