Blue Spruce (Picea pungens) – The native range of blue spruce is the central and southern Rocky Mountains; in Idaho, Wyoming, Utah, Colorado, New Mexico and Arizona. It is the state tree of Colorado and of Utah. In the wild Blue spruce grows to about 75 feet, but when planted in parks and gardens it seldom exceeds 49 feet. Blue spruce is a slow-growing tree, the oldest individual trees being found to live for 600 years or more. The trees begin to produce seed at about 20 years. Because of its cold hardiness, symmetrical pyramidal form, and waxy, blue-hued foliage, blue spruce is widely planted in ornamental and general landscape settings. It is used considerably for Christmas trees.