Description
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Latin Name: Abies concolor
Common Name: Rocky Mountain white fir, white fir, Colorado White Fir
Zone: 4-7
Mature Height: The mature height of the concolor fir typically ranges from 50 to 150 feet, depending on the growing conditions and specific location. The growth rate of concolor fir is generally moderate. Under ideal conditions, it can grow about 1 to 2 feet per year during its early years. As the tree matures, the growth rate may slow down.
Soil/ Climate: Concolor fir favors well-drained, acidic soils. It often grows in sandy loam or rocky soils found in mountainous regions. While it prefers moist conditions, it does not tolerate waterlogged soils.
Notes: The concolor fir typically has a straight trunk and can grow up to 150 feet tall. Its needles are soft, flat, and about 2 to 4 inches long, with a distinctive bluish-green or silvery hue. The cones are cylindrical and can be 3 to 6 inches long. They usually start out green and mature to a brown color. The bark is smooth and grayish when young, becoming thicker and more furrowed as the tree matures. Easily transplanted. White fir is widely planted as an ornamental tree in parks and larger gardens. White fir adds nice color to typical green winter foliage. It is popular as a Christmas tree. White fir can work reasonably well as a windbreak.
Problems: Bark beetles, such as the western pine beetle, can infest concolor firs, especially when the trees are stressed. Fungal diseases lead to needle cast, affecting the tree’s aesthetic and health. Extended periods of drought can weaken concolor firs, making them more susceptible to pests and diseases.
Wildlife: Concolor firs play a significant role in forest ecosystems, contributing to soil stability and carbon sequestration. The concolor fir provides habitat and nesting sites for various birds, including woodpeckers, chickadees, and owls. Its tall, sturdy branches offer protection and a place for nesting. The dense foliage of concolor firs serves as cover for many small mammals, providing shelter from predators. The cones of the concolor fir contain seeds that are a food source for various wildlife. Squirrels, chipmunks, and birds, such as crossbills and nuthatches, feed on these seeds. The soft, needle-like leaves are also consumed by some herbivores, including deer and mountain goats, particularly in winter when other food sources are scarce.
Cold Stream Farm supplies Concolor (White) Fir trees which are grown as bare root seedlings and transplants and sold both wholesale and retail with no minimum order.
Additional information on Abies concolor can be found on the link: USDA Plants Database
For More Information, visit:
Agriculture and Natural Resources | University of California
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