Shrub for sun, mostly sun, mostly shade, dappled shade, bright shade in zone 5a-9b. Pink, yellow, salmon flowers. Up to 6 x 5 feet Also known as Azalea 'Mount Saint Helens', Azalea Exbury 'Mt. St. Helens', Rhododendron Exbury 'Mt. St. Helens', Mt. St.