Pseudotsuga menziesii var. glauca, commonly known as the Rocky Mountain Douglas-fir, is an evergreen conifer native to the interior mountains of western North America, from British Columbia through the United States to northern Mexico. It thrives in various habitats, including dry slopes, rocky outcrops, and moist river valleys, typically at altitudes of 1969-9843 feet. This tree can reach impressive heights of 115-148 feet with a diameter of up to 6 feet, featuring a conical form that becomes more irregular with age. The needles are 1 inch long, typically gray-green to blue-green, contributing to its distinctive appearance. The species is known for its pendulous seed cones, which can be up to 4 inches long, with distinctive three-pointed bracts protruding from beneath the scales.

Rocky Mountain Douglas-fir is highly valued for its straight, tall growth and its wood’s strength and lightness, making it a preferred choice for structural timber, plywood, and various wood products. It is also planted for ornamental purposes, reforestation, and soil stabilization in mountainous regions. In cultivation, it requires full sun to partial shade, well-drained soil, and can tolerate a range of soil types, from acidic to neutral. While it is relatively low-maintenance, it can be susceptible to Douglas-fir beetle and root rot in poor drainage conditions. Its deep root system helps prevent soil erosion, and it provides vital habitat and food for wildlife, including birds and small mammals.CC BY-SA 4.0