Western Hemlock

About Western Hemlock in Alberta

Western Hemlock is one of Alberta's rarest native conifers: a moist-forest, shade-tolerant Pacific and northern Rocky Mountain tree reaching Alberta only in rare disjunct montane settings. In Alberta it is S1/G5, tracked in ACIMS, known from Jasper and Banff National Park montane contexts, and treated as climate-vulnerable. For ARA, any confidently identified wild or naturally established Western Hemlock in Alberta is significant, especially if it shows regeneration, nurse-log establishment, or a cool moist microclimate at the eastern edge of the species range.

Identification: Needles are short, flat, soft-looking, and variable in length, often arranged in a flattened two-ranked spray. The upper surface is shiny green to yellow-green, while the underside is glaucous with two pale stomatal bands.

Alberta range and habitat: Western Hemlock is rare and disjunct in Alberta, at the eastern edge of its range. Alberta occurrences are reported from the Montane Natural Subregion within Jasper and Banff National Parks, with at least one population possibly naturalized.