The Douglas fir, the state tree of Oregon, can grow incredibly tall and live impressively long. The oldest Douglas fir trees have lived to be over 1,000 years old. Fox News Media ...

Here, old-growth Douglas fir trees stand along the Salmon River Trail on June 25, 2004, in Mt. Hood National Forest outside Zigzag, Oregon. ... ‘Size and growth of tree rings ...

The oldest tree rings analyzed by the researchers came from a Douglas-fir that began as a seedling in the year 950 near Great Central Lake on Canada’s Vancouver Island.

If your gorgeous Douglas fir is looking sickly or defoliated, there’s one pest you’d better check for, and fast! We show you how to tackle the Douglas fir tussock moth ...

Tree-ring increment cores collected from bigcone Douglas fir trees growing on Mount Pinos in Southern California. Each growth ring is a couplet of light colored spring wood and dark colored summer ...

A U.S. Geological Survey diver checks for bark buried in the sediment around a 1000-year-old Douglas fir stump on the Olympic ... 14 spikes — from A.D. 774-75 — in the tree rings they ...

Conifers with leaf stalks called petioles will be bald cypress, hemlock, and Douglas fir trees. 1. of 3. Identifying the Major Firs. Robert Vidéki/Doronicum Kft. / Bugwood.org.

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.