Breeding habitat is open forested areas with conifers, mainly ponderosa pine, douglas-fir, and grand fir.

This enzyme is isolated from Abies grandis (grand fir).

European spruce fills some 20% of the forest, sometimes mixed with Douglas-fir and grand fir.

Vegetation is dominated by Western ponderosa pine forests, with some Douglas-fir and grand fir.

Upper north-facing slopes support grand fir, ninebark, and pinegrass.

Cool moist slopes feature grand fir, western larch, queen's cup beadlily, and prince's pine.

This plant occurs in the understory of mature forests, such as those composed of grand fir and Rocky Mountain maple.

Ponderosa pine can be found growing in canyons, while grand fir and subalpine fir grow at higher elevations.

The other common large conifers are grand fir and western red cedar.

The inner bark of the grand fir was used by some Plateau Indian tribes for treating colds and fever.