Western Hemlock
Tsuga heterophylla
BC's provincial tree. Abundant throughout the Tri-Cities in natural forest areas, especially on shaded north-facing slopes.
Identification
50-70m (165-230ft)
Up to 2.5m diameter with reddish-brown bark that becomes deeply furrowed with age
Short, flat needles (1-2cm) of varying lengths, arranged in flat sprays, with two white bands underneath
Small, delicate cones (2-3cm) that hang from branch tips
Key Identifying Features
- Graceful, drooping leader (top of tree)
- Feathery appearance from varied needle lengths
- Small, papery cones
- Lacy, delicate branch structure
- Two white stripes on needle undersides
Identification Photos
Click any photo to enlarge. Photos help with identification but may vary by age, season, and location.
Tree Care
Watering
Prefers consistent moisture and high humidity. Struggles in hot, dry conditions.
Pruning
Tolerates light pruning. Can be shaped as a hedge when young. Avoid removing the leader.
Best time: Late winter to early spring before new growth
Common Issues
- Western hemlock looper (defoliating caterpillar)
- Hemlock dwarf mistletoe
- Root rot in poorly drained sites
- Heat and drought stress
Maintenance Notes
Low maintenance in suitable conditions. Mulch to retain moisture. Protect from reflected heat and drought.
Root System
Shallow, wide-spreading root system
Roots typically extend 1-2x the canopy width, concentrated in top 45cm of soil
Potential Concerns
- Shallow roots make trees vulnerable to windthrow
- Less aggressive than cedars for infrastructure damage
- Sensitive to soil compaction and grade changes
- May share root grafts with neighboring hemlocks
Hazard Assessment
Common Failure Modes
- Windthrow, especially trees previously sheltered by removed neighbors
- Top breakage in ice storms
- Root failure in saturated soils
Warning Signs to Watch For
- Yellowing or thinning crown
- Dwarf mistletoe brooms (dense clusters of branches)
- Extensive woodpecker damage
- Lean with cracking soil at base
- Fungi at base indicating root rot
Removal Considerations
Key Considerations
- Can grow very tall, requiring crane or technical rigging
- Wood is dense and heavy
- Often grows close to other trees in natural stands
- Important wildlife tree (should assess for nests)
- Shade tolerance means it often grows under larger trees
Permit Notes
Any hemlock worth removing is past every threshold in the region. Permit thresholds vary across the region: any tree at all in Anmore and Belcarra, 15cm or 5m tall in Port Coquitlam, 20cm in Coquitlam, Maple Ridge, Pitt Meadows, New Westminster and Delta, and 30cm in Port Moody, Burnaby and Surrey. Hemlock is frequently removed for decay, and a dead or hazardous tree still needs the permit almost everywhere - the condition is what gets it approved, and sometimes waives the fee, but it does not remove the requirement.
Check the rules where the tree is
- Port Moody
- Coquitlam
- Port Coquitlam
- Anmore
- Belcarra
- Pitt Meadows
- Maple Ridge
- New Westminster
- Burnaby
- Surrey
- Delta
- Langley
Side-by-side comparison in our Tri-Cities tree bylaw guide. Each city page links to the municipality's own bylaw, which is the authority - these summaries are a starting point, not a permit decision.
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