Rhododendron hybrida ( Janet Noyes Glenn Dale Azalea )
erect to widely spread , compendious , evergreen plant azalea developed primarily for cold hardiness along the mid - Atlantic states . undivided , funnel shape - shape , dark violet - pinkish flowers with orange throat , 2 column inch wide . bloom are borne in showy trusses of 1 to 4 per cluster . heyday time is tardy April in warm areas and as deep as early June in cool climates ....