Science · Specimen Trees
Grand Fir
A tall western North American fir of relatively moist forests, with flattened aromatic needles. It needs cool-rooted conditions and is not a substitute for drought-adapted pines on exposed hot sites.
Abies grandis · Large evergreen true fir
Profile
- Needles
- Flattened needles often arranged in two ranks, with pale stomatal bands beneath.
- Cones
- Upright cones disintegrate on the tree, as in other true firs.
- Planting
- Set the root flare at grade and protect the expanding root zone from compaction.
- Assessment
- Confirm identity, local climate suitability and drainage before prescribing care.
Water & soil targets
- Moisture (VWC)
- Site-calibrated; varies by soil and rootstock
- Salinity tolerance
- Prefer low-salinity irrigation.
- Drought tolerance
- Low to moderate depending on provenance.
Optimal root measurement depth
8–18 in
Most absorbing tree roots live in the upper 12–18 inches, out toward the drip line. Typical guidance; confirm with a soil probe on site.
Supply consistent moisture during establishment and summer dry spells with good drainage; avoid hot confined beds and chronic saturation.
Problems to watch
- Balsam woolly adelgid
- Fir engraver beetle
- Root rots
Stress signs
- Needle loss
- Reduced new growth
- Top dieback
Where you'll find it
- Cool-climate specimens
- Forestry and Christmas trees
More specimen trees
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All Science profilesGeneral agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.