Tsuga canadensis 'Macrophylla' is a fast growing, tree form of Canadian hemlock with ascending branching and exceptionally larger than what is typically seen in this species. Needles measure (10 - 15 mm) long and (2 mm) wide. After 10 years of growth, a mature specimen will measure 10 feet (3 m) tall and 4 feet (1.3 m) wide, and annual growth rate of around 12 inches (30 cm).
This cultivar has been known to botanical literature since the 1890s when Ludwig Beissner first recorded it as Tsuga canadensis var. marcrophylla in Handbuch der Nadelhölzekunde. Within, Beissner speculates French origin. In 1930, Jost Fitschen first placed it in cultivar status in his book, The Conifer Manual.
