White (Concolor) Fir
White firs are large, densely-growing, narrow trees with a dome-shaped crown growing to 50 feet or more. Native to the mountainous regions of the western United States, this tree is the most drought-resistant of all native firs. Although it can exist on poor, dry sites, the white fir grows most vigorously in moist, well-drained, acid soils in protected locations. An important horticultural plant in the eastern states, it is commonly planted in Canada because of its attractive foliage, moderately fast growth, hardiness, and drought and shade tolerance.