White flowers, VIII–X; bright green foliage, the young shoots with yellow tips in spring; height 21–25cm; spread 31–45cm. Outstanding.
Wild-collected; found on Calf of Man by F. J. Chapple about 1965; introduced by Slieve Donard Nursery (Newcastle, County Down, Northern Ireland) in 1967.
Named after Ruby (1909-1985; nee Rebecca Mills), wife of Leslie S. Slinger, proprietor of the Slieve Donard Nursery (see Calluna vulgaris ‘Leslie Slinger‘).
