Canadian Hemlock – Tsuga canadensis - Canadian (Eastern) Hemlock achieves its best growth in evenly moist, acidic, organic, rich, well-drained soils in partial shade to partial sun. Canadian Hemlock does not tolerate wet soils, nor prolonged drought. Strongly windswept areas and air polluted sites should be avoided. Canadian hemlock can reach a height of 70 feet with a 35 foot spread.