Rhododendron hybrida ( Galathea Glenn Dale Azalea )
just to widely spreading , twiglike , evergreen plant azalea developed primarily for cold hardihood along the mid - Atlantic United States Department of State . Single , funnel shape - determine , slow cerise heyday , 1 1/2 inches wide . flower are borne in showy truss of 1 to 4 per cluster . flush time is late April in warmer areas and as late as former June in cooler climates ....