Rhododendron hybrida ( Corydon Glenn Dale Azalea )
Upright to widely spreading , evergreen plant azalea developed principally for cold hardiness along the mid - Atlantic state . exclusive , funnel - shaped , rich violet - pink blossom , 2 to 2 1/4 inches wide . Flowers are bear in showy trusses of 1 to 4 per clustering . Bloom time is late April in warm areas and as belatedly as other June in cooler climates . Plant as you would any of the other azaleas : gamey and in well - drain , acidulent soil , deep with organic matter ....