Douglas Fir
Pseudotsuga menziesii
Dominant tree species in the Tri-Cities, found on virtually every forested property. Named after Scottish botanist David Douglas who documented the species.
FormbarkbarkHow to recognise it
Height
60-75m (200-250ft), one of the tallest trees in the world
Trunk
Up to 2m diameter with thick, deeply furrowed grey-brown bark on mature trees
Needles
Flat, soft needles (2-3cm) arranged spirally around the twig, with two white bands underneath
Cones
Distinctive 5-10cm cones with three-pointed bracts ("mouse tails") extending beyond scales
Quick check
- Unique cones with three-pointed bracts
- Soft, flat needles (not sharp like spruce)
- Deeply furrowed bark on mature trees
- Conical crown shape
- Reddish-brown buds with pointed tips
Photo guide
5 things to look for: photographs coming
Care
Watering. Drought-tolerant once established. Young trees need regular watering for first 2-3 years.
Pruning. Generally requires minimal pruning. Remove dead branches and competing leaders. Does not respond well to heavy pruning. Best time: Late winter while dormant, or early summer after spring growth
Maintenance. Low maintenance. Avoid soil compaction around roots. Allow needle drop to create natural mulch.
Common issues
- Swiss needle cast (fungal disease)
- Douglas fir beetle in stressed trees
- Laminated root rot (Phellinus weirii)
- Cooley spruce gall adelgid
Roots
Initially taproot, developing extensive lateral roots with age Lateral roots can extend well beyond the drip line, often 1.5x canopy width
Hazards
Windfall risk
Low
Branch drop risk
Medium
Warning signs to watch for
- Crown thinning or yellowing needles
- Conks or mushrooms at base indicating rot
- Woodpecker activity (may indicate beetle infestation)
- Resin bleeding from trunk wounds
Removal considerations
Difficulty: Very HighTypical cost: $$$$- Often the tallest trees on a property
- Heavy, dense wood requires powerful equipment
- Deep root system makes stump removal challenging
- May require multiple days for large specimens
- Frequently host to protected wildlife
Permits
Any Douglas Fir big enough to worry about is past every threshold in the region. Permit thresholds vary across the region: 15cm or 5m tall in Port Coquitlam, 20cm in Anmore, Coquitlam, Maple Ridge, Pitt Meadows, New Westminster and Delta, 30cm in Port Moody and Surrey, and 30.5cm for conifers in Burnaby (Belcarra regulates only trees 5m+ in its mapped permit areas). Large firs also tend to trip the 'significant tree' rules that sit above the basic threshold, at 45cm in Port Coquitlam and 60cm in Maple Ridge, which raise the replacement requirement. Budget for an arborist report.
Tree bylaws by city