|R. viscosum, the swamp or sweet azalea of the eastern U.S., is a deciduous shrub with spreading branches and fragrant, pink-blushed white flowers. Leaves are small and dark green; flowers are borne very late in the season in trusses of 4 to 12. It prefers damp soil and full sun.
The deciduous azalea is known for excellent fall color and unsurpassed spring flowers. It is usually less picky about soil, though it too prefers acid conditions. Though azaleas have a potentially large list of possible pest and disease problems, they are usually trouble free if planted correctly in proper cultural conditions.