Keeping the Legacy Alive

Nova Scotia Hemlock

The Eastern Hemlock (Tsuga canadensis) is a coniferous tree native to Eastern North America.  It is conical in shape, with a wide trunk tapering at the top and drooping branches.  The bark is scaly when young and deeply furrowed when the tree becomes old.  The 1-2 cm needles are shiny green on top and pale underneath.  The oval shaped cones are 12-20 mm long.
© C.Gray
© C. Gray
© C.Gray
© C. Gray

© Alain Belliveau
A Foundation Species
Foundational species perform unique ecological functions and create their own environmental conditions. Dense shade cast by hemlock regulates temperature of understories and provides protection from harsh weather. Low hemlock transpiration, compared to hardwoods, and cooling effects maintain more stable hydrology. Slow decomposition of hemlock needles regulates soil nutrient cycling processes and supports unique biota, including fungi and insects.

© C.Gray
Massive and Majestic Old-Growth
Old-growth forests provide more stable environments than young forests, which support ecosystem services by allowing for greater moisture retention and carbon sequestration. They have higher genetic diversity than young forests and are more resilient to impacts from climate change or disease. They also support greater biodiversity by providing unique habitat for sensitive or specialized mosses, lichens, fungi, bacteria, insects, birds, and mammals. Primarily due to human disturbance, less than 1% of Nova Scotia’s forests are over 100 years old, of which many are hemlock dominant.

© C. Gray
Spiritual and Indigenous Values

"An old-growth hemlock forest is a place of inspiration, a place to regain serenity and equilibrium." -Martin Buber

© Abby Lewis
Aquatic Habitat Integrity and Wildlife Habitat
Hemlock stands provide valuable wildlife cover and maintain aquatic habitat integrity on brooks, streams, and rivers. Hemlock cover can provide wintering areas for deer and moose, which may offer shelter from harsh weather and lower snow depths. Multi-layered canopies in hemlock stands also provide habitat for birds such as the black-throated green warbler, blackburnian warbler, and the Acadian flycatcher. Brook trout habitat is supported by cool, shaded streams under dense hemlock canopies.

© C. Gray
Ecosystem Services
Like other tree species, hemlock provide ecosystem services by reducing storm-water runoff, controlling erosion, regulating temperature, reducing wind exposure, absorbing pollution, producing oxygen, storing carbon dioxide, and providing habitat. While some functions may be permanently reduced or lost, following declines due to hemlock mortality, some ecosystem services will eventually be compensated by other tree species.  
Experience an Old Growth Forest with Jenna Martin
CFIA HWA Sites Map

© Updated HWA Map August 2021