Douglas fir in the context of Rocky Mountain Douglas-fir

Pseudotsuga menziesii var. menziesii, commonly known as coast Douglas-fir, Pacific Douglas-fir, Oregon pine, or Douglas spruce, is a very tall evergreen conifer, being a variety of P. menziesii (Douglas-fir).

It is native to western North America and is used as timber.

The Giant Forest, famed for its giant sequoia trees, is within the United States' Sequoia National Park. This montane forest, situated at over 6,000 ft (1,800 m) above mean sea level in the western Sierra Nevada of California, covers an area of 1,880 acres (7.6 km). The Giant Forest is the most accessible of all giant sequoia groves, as it has over 40 mi (64 km) of hiking trails.

Five of the ten most massive trees on Earth are located within the Giant Forest. The largest of these, the General Sherman Tree, measures 36.5 ft (11.1 m) across the base. The giant sequoia is the world's most massive species of tree and is one of the six species documented to grow to 300 ft (91 m) in height; the others are coast redwood, yellow meranti, Eucalyptus regnans, Douglas fir, and Sitka spruce. It is also among the longest-lived of all trees in the world.

Clearcutting, clearfelling or clearcut logging is a practice in forestry and logging, in which most or all of the trees in an area are uniformly cut down. Along with shelterwood and seed tree harvests, it is used by foresters to create certain types of forest ecosystems and to promote select species that require an abundance of sunlight or grow in large, even-age stands. Clearcutting is a forestry practice that mimics the stand initiation stage of forest succession after a natural disturbance such as stand replacing fire or windthrow, and is successful for regeneration of fast growing, sun tolerant tree species and wildlife species that readily regenerate in post-stand replacing sites. Logging companies and forest-worker unions in some countries support the practice for scientific, safety and economic reasons, while detractors consider it a form of deforestation that destroys natural habitats and contributes to climate change. Environmentalists, traditional owners, local residents and others have regularly campaigned against clearcutting, including through the use of blockades and nonviolent direct action.

Clearcutting is the most economically efficient method of logging. It also may create detrimental side effects, such as the loss of topsoil, the costs of which are intensely debated by economic, environmental and other interests. In addition to the purpose of harvesting wood, clearcutting is used to create land for farming. Ultimately, the effects of clearcutting on the land will depend on how well or poorly the forest is managed, and whether it is converted to non-forest land uses after clearcuts.

In agriculture, gardening, and landscaping, barkdust (also bark dust, bark chips, bark mulch, beauty bark, tanbark, tan bark, or simply bark) is a form of mulch produced out of chipped or shredded tree bark. Coarser forms of barkdust may be known as bark nuggets. Trees typically used in the production of barkdust include the Douglas fir and the western hemlock.

David Douglas (25 June 1799 – 12 July 1834) was a Scottish botanist, best known as the namesake of the Douglas fir. He worked as a gardener, and explored the Scottish Highlands, North America and Hawaii, where he died. The standard author abbreviation Douglas is used to indicate this person as the author when citing a botanical name.