Aspen forest is reclaiming the skyline of Yellowstone National Park after decades of controversy over efforts to return ...

Aspen trees are getting a boost from wolves at Yellowstone National Park, new research suggests. For the first time in 80 years, baby aspens are growing tall and healthy in the northern part of the ...

Gray wolves were reintroduced in Yellowstone National Park in 1995 to help control the numbers of elk that were eating young ...

The quaking aspen (Populus tremuloides) is one of Colorado’s most iconic trees and maybe its most dramatic. With smooth white ...

Some aspen trees have grayish-white bark when they are young or on higher branches, but the bark won’t peel like paper birch.

To carve an aspen tree — to take a blade to the trunk for the sake of your initials, for example — is to do harm. Harm to a being with a life expectancy much like our own: 100 years, if we ...

For some trees, winter does not mean a complete cessation in photosynthetic activity or growth. Quaking aspens store chlorophyll beneath their bark (particularly in younger trees), this is what ...

To carve an aspen tree — to take a blade to the trunk for the sake of your initials, for example — is to do harm. Harm to a being with a life expectancy much like our own: 100 years, if we ...