A Technical Report from The Bartlett Tree Research Laboratories
Hemlocks are widely used as landscape trees because they keep their attractive foliage year round, they are shade tolerant, and they withstand heavy shearing.
The hemlocks generally require well drained, cool, acid soils. Uniformly moist soil conditions are important. This is best achieved with mulches in most landscape situations. Hemlocks do not thrive under hot, dry conditions. They grow well in partial shade and will tolerate full shade. Hemlocks also grow well in full sun if their soil requirements are met. They will not withstand air pollution and are susceptible to salt damage.