Rocky Mountain Douglas-fir Blue Douglas-fir Inland Douglas-fir Colorado Douglas-fir
Pseudotsuga menziesii var. glauca
Pinaceae · coniferous tree · native
Last updated
Data Coverage 2 of 6 dimensions
Pseudotsuga menziesii var. glauca (Pinaceae) is the interior, Rocky Mountain variety of Douglas-fir. It is native from the eastern slopes of the major western mountain ranges through the Rocky Mountain states. It is smaller than the coastal form (typically to 130 feet), with glaucous (bluish-green) foliage and smaller cones.
Rocky Mountain Douglas-fir is more cold-hardy and drought-tolerant than the coastal form but slower growing and shorter-lived (typically under 400 years). It grows in full sun on well-drained soil. The blue-green foliage makes it more ornamental than the coastal form for landscape use. Hardy in Zones 4a to 8b.
Quick Facts
Height
130 ft
Light
Full Sun
Hardiness
Zone Zones 4a–8b
Bloom Time
Non-flowering
Origin
Pacific Northwest native
Diseases (14)
Leptographium wageneri Black-Stain Root Disease Botrytis cinerea Gray Mold [VERIFY] Lower Stem Canker Rhabdocline spp Needle Cast, Rhabdocline Nothophaeocryptopus gaeumannii Needle Cast, Swiss Thekopsora minima and Naohidemyces vaccinii Rust Botryosphaeria corticis Stem Canker Phoma spp. Upper and Lower Stem Canker (Phoma Blight) Yellow-green Mottle Syndrome Diaporthe phaseolorum Upper stem canker Rhabdocline pseudotsugae Rhabdocline needle cast Nothophaeocryptopus gaeumannii Swiss needle cast Coniferiporia sulphurascens Laminated Root Rot Armillaria ostoyae Armillaria Root Rot
Pests (12)
Aphidoidea Aphid Coccus hesperidum Brown soft scale Dioryctria spp. Coneworm Adelges cooleyi Cooley spruce gall adelgid Contarinia pseudotsugae Douglas-fir needle midge Orgyia pseudotsugata Douglas-fir tussock moth Cylindrocopturus furnissi Douglas-fir twig weevil Chionaspis pinifoliae Pine needle scale Synanthedon novaroensis Pitch moth Lophocampa argentata Silverspotted tiger moth Oligonychus ununguis Spruce spider mite Synanthedon sequoiae Sequoia pitch moth