Autumn may be coming or has arrived, but spring-flowering ‘Summer Snowflake’, a selection of doublefile viburnum (Viburnum plicatum var. tomentosum) continues to bloom. Native to Japan, doublefile viburnums are in a league of their own. Summer Snowflake grows 15 to 18 feet tall and a narrow 6 to 9 feet width or roughly 2:1 height […]