Look beyond Colorado’s shimmering yellow aspen trees for wonderful leaf ... autumn changes in Washington Park in 2003. (Cyrus McCrimmon, The Denver Post) Rickenbacker predicts this fall ...

As chlorophyll breaks down during the fall, the leaves unveil the pigments hiding underneath. If chlorophyll wasn’t present in leaves at all, trees would show their autumn hues all year long ...

So when the leaves fall off, they're getting kicked out by the tree on purpose. "Trees lose their leaves to conserve energy and to reduce the amount of damage they could sustain during the winter ...

In the Arizona high country or along riparian areas, cottonwood, ash, aspen and other deciduous trees grow and, come fall, drop their leaves. This is an essential part of the trees’ life cycles.

but fall is especially stunning with golden light and blue skies and sometimes even a dusting of snow. These photos were all shot in the high country among the aspen trees around the region during ...

but few things say “fall” like leaves of yellow, orange and red topping trees and littering lawns. “Every leaf speaks bliss to me / Fluttering from the autumn tree,” wrote 19th-century ...

Autumn brings a range of colours to our woodlands - setting the scene with a stunning array of reds, browns and yellows as the tree leaves transform in response to cooler temperatures. And through ...

Get ready for scenic drives and jumping into leaves, autumn-lovers. The fall season calls ... the tall Aspen turns into a brilliant gold. These trees are Colorado's favorite, and their genetics ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. Certain broadleaf trees can be uniquely identified by their brilliant ...