Why do Leaves Change Colors?
Submitted by Dennis Wilson, Forester at Land Between The Lakes National Recreation Area Colors The easiest way to explain why leaves change colors has to do with the time of year. The longer and cooler nights trigger the changing colors and falling leaves. None of the other environmental influences – such as temperature, rainfall, food supply – are as unvarying as the steadily increasing length of night during autumn. As days grow shorter, and nights grow longer and cooler, biochemical processes in the leaf begin to paint the landscape with Nature's autumn palette. A color palette needs pigments, and there…
