Flame Azaleas grow wild  in the Southern Appalachian Mountains. Flame azaleas come in varying shades of orange, deep orange to a more yellow-orange. These (below) grow and bloom in the dense woods on Cherry Mountain.

We also have a pink wild azalea (below) that was transplanted to Cherry Mountain from the wild of Rocky Face Mountain in Dalton, Georgia in the late 1960s. 

Flame Azalea can grow as tall as a tree, as this one photographed recently on Mother's Day at Hamilton Gardens on Lake Chatuge near Hiawassee, Georgia.