Bigcone Douglas-fir

Pseudotsuga macrocarpa

Pinaceae · conifer · introduced

Quick Facts

Height

75 ft

Growth Rate

Moderate

Light

Full Sun

Soil

Well Drained

Water

Low

Hardiness

Zone Zones 7a–8b

Bloom Time

Mar 1-Mar 31

Origin

southern California, in mountainous areas from Kern County

Phenological Calendar

Stage	Typical Window	What to Look For
Bud break BBCH 07	Feb 15-Mar 15	Buds swelling and beginning to open; first green tissue visible
Leaf emergence BBCH 11	Mar 1-Apr 1	First leaves fully unfurled on new growth
Bloom start BBCH 61	Mar 1-Mar 31	First open flowers visible; flowers yellow
Bloom end / petal fall BBCH 69	Apr 1-Apr 15	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	Jun 1-Aug 31	Fruit or seed structures forming; fruit color: brown
Fruit/seed maturity BBCH 85	Sep 1-Nov 30	Fruit fully colored and ripened; seed dispersal may begin
Leaf drop BBCH 93	Oct 15-Nov 30	Leaves yellowing and dropping; no significant fall color display
Dormancy BBCH 97	Nov 15-Feb 28	Leafless; no active growth; dormant buds set

Diseases (14)

Leptographium wageneri Black-Stain Root Disease

Botrytis cinerea Gray Mold

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

Upper stem canker

Rhabdocline needle cast

Swiss needle cast

Coniferiporia sulphurascens Laminated Root Rot

Armillaria ostoyae Armillaria Root Rot

Pests (12)

Cinara occidentalis, Cinara abietis Aphid

Brown soft scale

Adelges cooleyi Cooley spruce gall adelgid

Douglas-fir needle midge

Orgyia pseudotsugata Douglas-fir tussock moth

Douglas-fir twig weevil

Chionaspis pinifoliae Pine needle scale

Silverspotted tiger moth

Oligonychus ununguis Spruce spider mite

Sequoia pitch moth