Douglas fir is the most abundant tree species in the Pacific Northwest. It’s Oregon’s official state tree. And it’s arguably the region’s most important timber species.

Today, a Swiss needle cast epidemic affects about 3 million acres of coastal Douglas fir. A whole range of variables may have contributed to this sudden outbreak of a native tree disease, ...

Whether growing along the rim of the Grand Canyon or living in the mist with California’s coastal redwoods, Douglas fir trees are consistently sensitive to drought conditions that occur throughout the ...

Managing Douglas-fir Forests For Diversity Date: May 15, 2009 ... in mixed stands that are low in productivity but may have the potential to provide cover and forage for a range of wildlife ...

PORTLAND, Ore. (KOIN) – Drier air caused by the changing climate is stressing Douglas fir trees, Oregon State University researchers say. The stress these trees experience from drier air is more ...

Mature Douglas fir can reach heights of 300 feet and 10 feet in girth. In addition, Douglas-fir can live for 1,000 years, earning the moniker “old growth” or “ancient” forest.

Spraying is much more difficult for homeowners, especially when screening evergreens get beyond the 15-foot range. Hiring a pro to do the job can keep your Douglas firs alive, but it'll get expensive.

The Douglas fir thrives in deep forests where their collective crowns, like those of redwoods, host communities of lichen, fungi and insects. An entire world can be found in them high above ground.

The Douglas fir can grow several hundred feet and live for over 1,000 years. Oregon's state tree, the Douglas fir, comes in two types, coast and Rocky Mountain.

The Douglas-fir tussock moth is a native to western North America, and its geographic range is coincident with the range of Douglas-fir; both species are found in British Columbia, all of the western ...