It grows 60 to 75 feet tall and wide. Learn how to keep shade trees thriving. Quaking aspen (Populus tremuloides) is also called trembling aspen because the leaves flutter in the slightest breeze.

JT Thomas It's a relentlessly sunny day in the Rocky Mountains, and here at 9,000 feet, on the Grand Mesa in western Colorado, the aspen trees should be casting a shadow. But something is wrong in ...

Cottonwoods, along with related big-toothed and trembling aspens, are poplars — some of New England’s fastest-growing tree pioneers.

DENVER (KDVR) — A Colorado-based company is installing a new art exhibit on the 16th Street Mall to make it look like a canopy of aspen trees is growing across the strip. On Monday, the Denver ...

Artist Michael Young works on the upper reaches of the aspen trees in the lobby of Estes Park Health, part of the fourth ...