Rhododendron hybrida ( Cinderella Glenn Dale Azalea )
Upright to widely spread , semi - evergreen azalea develop primarily for frigid hardiness along the mid - Atlantic states . individual , funnel - shaped , white flowers with red bar , 2 to 2 1/2 inches wide . Flowers are bear in showy trusses of 1 to 4 per cluster . blooming time is late April in warm arena and as late as former June in nerveless climate ....