Why do leaves change color in the fall? When exactly do they change, and how does the process occur?
What Causes Leaves to Change Color?
First of all, not all leaves turn vivid colors in the fall. Only a few of our many species of deciduous trees—notably maple, aspen, oak, and gum—produce stellar performances for our annual autumn spectacular in North America.
Several factors contribute to fall color (temperature, precipitation, soil moisture), but the main agent is light, or...