Rhododendron hybrida ( Folly Glenn Dale Azalea )
vertical to wide spreading , evergreen azalea prepare mainly for cold hardiness along the mid - Atlantic state . individual , funnel - shape , lily-white flowers with mauve stripes , 2 3/4 to 3 inches wide . flower are borne in showy trusses of 1 to 4 per cluster . blush time is recent April in warmer areas and as recently as early June in cool mood . Plant as you would any of the other azaleas : gamey and in well - drain , blistering ground , ample with organic matter ....