Shrub Tsuga canadensis 'Jervis' [Dwarf Canadian Hemlock] 'Jervis' is a dense, compact, dwarf cultivar with an irregularly pyramidal form. Foliage browns in dry soil, drying wind, and winter sun in very exposed sites. Does not tolerate long periods of drought. Can be scorched by full sun and temperatures above 95 degrees F. Many minor pest problems, with wooly aldelgids being especially serious in the Northeast US.