A Canadian hemlock hedge is also known as Tsuga canadensis and is an evergreen hedge good for borders and screenings, according to the Arbor Day Foundation. Canadian hemlock plants grow 40 to 70 feet high and 25 to 35 feet wide.
The Canadian hemlock prefers full sun or lightly shaded environments and should not be grown in heavy soils. It grows well in USDA Hardiness Zones 3 to 8. In 1736, this plant became popularized in landscapes and is from the pine family of trees. While it has a hemlock name, this tree is not to be confused with the poison that Socrates drank.