Some clones are thousands of years old, although individual trees live 150 years ... where the Coconino National Forest has fenced off several hundred acres of aspen, foresters hope the barriers ...

How, after all, could such old trees have survived the ... old growth into a transitional forest—called an ecotone—of black cherry, big-tooth aspen, red maple and white ash.

Pando is an ancient quaking aspen tree (Populus tremuloides ... Some of Pando's stems are more than 130 years old, according to the Forest Service, and the plant should continuously regenerate ...

Next they turned to fire to see if possibly a reduction in the number of forest fires ... that most the trees were at least 70 years old. It appeared that the aspen trees had stopped regenerating ...

Given that aspen, like all Scotland’s native trees, has been greatly reduced from its previous distribution, this raises the question of whether we might have had aspens as large and old as that ...