Mountain hemlock trees live as long as 1000 years: longer than the Pacific silver fir.

The plants occur at elevations within the Pacific silver fir and grand fir zones.

Pacific Silver fir seedlings and saplings are often found growing under their own canopies or those of a mixed canopy forest.

It is more tolerant than all its associates except Pacific silver fir, western hemlock, and Alaska cedar.

The understory communities of the Pacific Silver Fir can vary depending on moisture availability.

The trail passes through a climax community of pacific silver fir and related species of disparate ages with many standing snags.

Forests to the east in the Cascade Range include Pacific silver fir as well as western hemlock and western red cedar.

Mountain hemlock is more commonly the major climax species in the mountain hemlock zone south of central Oregon where Pacific silver fir does not occur.

The Pacific Silver Fir zone is in some of the steepest parts of the topography and heavy snow often leads to avalanche gullies.

The Pacific Silver Fir (Abies amabilis) is extremely tolerant of shade and does not fare as well in drought or warmer temperatures.

Vegetation in the Waldo Lake Wilderness consists mostly of Douglas-fir, mountain hemlock, and Pacific silver fir.

Pacific silver fir is a major climax species in many communities of the mountain hemlock forest in British Columbia and Washington and northern Oregon.

The glaciated region is roughly 89% forested with Noble fir, western hemlock, cedar species, pacific silver fir, mountain hemlock and several other tree species.

Douglas-fir and Noble Fir are the dominant species at higher elevations, and Pacific Silver Fir is the climax species.

Laminated root rot mainly attacks Douglas fir, Mountain hemlock, Western hemlock, Grand fir, and Pacific silver fir.

Other species include Western Redcedar and Pacific Silver Fir, Grand Fir, and Noble Fir.

Douglas fir, Mountain hemlock, Western hemlock, Grand fir, and Pacific silver fir are highly susceptible to infection with P. Weirii.

Typical montane forests in this ecoregion is dominated by Pacific Silver Fir and also contains Noble fir, Douglas-fir, and Alaska yellow-cedar.

Examples of Pacific Silver Fir forests can be found in the Commonwealth Basin and the Snow Lake areas of the Alpine Lakes Wilderness.

It is a very shade-tolerant tree; among associated species in the Pacific Northwest, it is matched or exceeded in shade tolerance only by Pacific yew and Pacific silver fir.

Other plants that grow in the region are Pacific madrone, salmonberry, Pacific silver fir, bracken fern, manzanita, thimble-berry, Pacific dogwood, bitter cherry, snowberry, some rose species, and cascara.

Since the Siskiyous trend both north to south and then east to west, they hold species that range from coastal, like coast redwood, to Cascadian, like Alaska yellow-cedar and Pacific silver fir.

In addition, the headwaters of the Salmon River in the wilderness also hold a relict stand of Pacific silver fir, which is the southern most stand in the range of the species.

Cryic soils support mixed coniferous forests dominated by mountain hemlock, lodgepole pine, and Pacific silver fir; they are colder than the mesic and frigid soils of the Southern Cascades.

While the west side is heavily forested and features species such as Douglas firs, western hemlock, Pacific silver firs, and Alaska yellow cedars, the eastern half is only forested at low elevations.

The Pacific Silver Fir (Abies amabilis) is extremely tolerant of shade and does not fare as well in drought or warmer temperatures.