Canadian Hemlock
Tsuga canadensis
Canadian Hemlock is a graceful, shade-tolerant evergreen conifer with soft, feathery foliage and drooping branch tips. It is widely used for hedges and woodland gardens in cool climates.
- Light
- Part shade to full sun
- Water
- Moderate; keep soil moist
- Difficulty
- Moderate
Got a plant like this?
Identify any plant from a photo, free.
Overview
Canadian Hemlock (Tsuga canadensis), also called eastern hemlock, is an evergreen conifer native to eastern North America. It is valued for its soft, delicate texture and graceful, slightly weeping habit.
It is unusually shade tolerant, naturally forming the understory and slopes of cool, moist forests, where it can live for several centuries and reach 60 to 80 feet tall. Its fine foliage and tolerance of shearing also make it one of the few conifers well suited to clipped hedges in shade.
Unfortunately, native stands are seriously threatened by the hemlock woolly adelgid, an invasive insect pest.
How to identify it
Identified by short, flat needles and a soft, drooping habit.
- Needles: Short, flat needles about 0.5 inch long, dark green above with two white bands beneath, arranged in flat sprays
- Branch tips: Gracefully drooping, including a nodding leading shoot at the top
- Cones: Small, oval, pendant cones about 0.75 inch long
- Bark: Greyish to reddish-brown, becoming deeply furrowed with age
- Size: Typically 40 to 70 feet tall, with a broadly pyramidal crown
Care & growing
Prefers cool, moist, sheltered conditions and dislikes heat and drought.
- Light: Part shade is ideal; tolerates full shade and full sun in cool climates
- Water: Keep soil consistently moist; intolerant of drought
- Soil: Moist, well-drained, acidic soil rich in organic matter
- Temperature: Cold hardy (USDA zones 3 to 7); dislikes heat, wind, and air pollution
- Feeding: Light feeding in spring if needed
- Pruning: Tolerates shearing well, making it suitable for hedges
- Pests: Monitor for hemlock woolly adelgid, a serious pest; treat if found
- Propagation: From seed or cuttings
Habitat & origin
Native to eastern North America, from eastern Canada south through the Appalachian Mountains, growing in cool, moist ravines, north-facing slopes, and shaded streamsides.
It is an important forest tree and is also planted as an ornamental and hedge in cool-temperate gardens. Many native populations are in decline due to the invasive hemlock woolly adelgid.
Frequently asked questions
Does Canadian Hemlock grow in shade?
Yes. It is one of the most shade-tolerant conifers and naturally grows as a forest understory tree, making it valuable for shaded sites and hedges.
What is the hemlock woolly adelgid?
It is an invasive sap-sucking insect that appears as small white woolly masses on the undersides of twigs. It can kill hemlocks and is a major threat; affected trees may need treatment.
Can it handle hot climates?
Not well. It prefers cool, moist, sheltered conditions and struggles with heat, drought, wind, and pollution.
Canadian Hemlock guides
In-depth guides for identifying, growing, and caring for Canadian Hemlock.
