Do you know what type of Azalea it is? Indoor Azaleas are generally grown in greenhouses so they will thrive in an indoor environment. The two basic types of Azaleas are deciduous Azaleas and evergreen Azaleas. Deciduous azaleas are native to the eastern and western United States and some part of Asia and Europe and hybrids of these species. They are grown outdoors. Evergreen azaleas originated in Japan and will grow indoors and outdoors.