These strikingly beautiful white trunked trees grow extensively in certain climate zones. In Arizona, the trees grow above 7000 feet. Driving over the Kaibab Plateau in northern Arizona, gives you a dramatic example of the trees' sensitivity to altitude. As you drive up and down the hills, the trees keep appearing and then disappearing depending on the slight altitude loss or gain. They are most apparent in the Spring when their bright green leaves contrast with the darker colors of the evergreens. Again in the Fall they show dramatically with bright yellow-gold or crimson leaves.
Aspens grow in clumps from a single root system. Groups of aspen trees may be some of the oldest living trees.
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