Coastal Douglas-fir (Fdc)
Coastal Douglas-fir is one of the more widely planted coastal species. The vigorous growth of the species makes it desirable for many reforestation programs.
The major limiting factors that stock type selection can address are vegetation competition and animal damage. At the extremes of its elevational range, snow damage, and vegetation press may also be limiting factors.
Correct seedlot selection, attention to seed transfer, and timing of planting are critical for coast-interior transition Fdc where drought is a major limiting factor.
Coastal Douglas-fir (Fdc)
Plate 25. Fdc stock types. Note the increased size and number of lateral branches on the 415D and 615A. (Arrowheads indicate target heights.)
Coastal Douglas-fir grows extremely quickly in the nursery and should never be requested in small containers or as 2+0 containers because of the increased incidence of foliage and root disease, and height management problems.
For summer planting, the vigorous nursery growth demands that this species be taken to the field for planting as soon as the buds have been set. The vigorous growth also limits the ability to hold summer-plant stock over for spring planting. Holding the plants too long in the nursery will result in reflushing. Top-pruning is not recommended, but if operationally required, it must be performed in June. If the tops are pruned in July after buds have been initiated, the plants may completely reflush.
For hot lift planting in the fall, it is critical that seedlings be fully hardened off or else they will be prone to reflushing, with an increased probability of reduced survival.
If the handling requirements associated with large stock types can be met, PBR .5+1.5 and BBR 2+0 are appropriate stock types for low elevation sites with soils at least 30 cm deep. The large, specialty stock types are appropriate for the most severe brush competition and browsing conditions. The PSB 313B, 410 and 412A stock types may be at a slight advantage under droughty site conditions in the coast-interior transition due to their reduced shoot/root ratios.
|Fdc stock type suitability.|
|Recommended stock types:|
|PSB 313B 1+0||Sp, Fa||Poor||Poor||Poor||Fair|
|PSB 410 1+0||Sp, Fa||Fair||Fair||Poor||Fair|
|PSB 415B 1+0||Sp, Fa||Fair||Fair||Fair||Fair|
|PSB 412A 1+0||Sp, Fa||Good||Good||Fair||Fair|
|PSB 415D 1+0||Sp, Fa||Good||Good||Good||Fair|
|PSB 512A 1+0||Sp||Good||Good||Good||Fair|
|PSB 515A 1+0||Sp||Good||Good||Good||Fair|
|PSB 615A 1+0*||Sp||Good||Good||Good||Fair|
|BBR 2+0*||Sp only||Good||Good||Good||Poor|
|PBR .5+1.5*||Sp only||Good||Good||Good||Poor|
|*||Used for major limiting factors; special handling requirements.|