Why Do Leaves Change Colors?
It's that time of year again. Most trees are no longer green instead sporting richly colored coats of yellow, orange and red which brings up the perennial question, "Why do leaves change color?" There are massive scientific answers but very simply it's because Autumn is a very revealing time... All spring and summer photosynthesis is going on in the leaves. Chlorophyll is produced causing the leaves to be green and the leaves are giving off oxygen. This is their season and they are contributing to the good of the world around them. Then the nights get cool and the weather drier and suddenly what has worked for months works no longer. The flow of nutrients from the tree is cut off and the chlorophyll disappears and the there is no more green color. What is revealed are the colors they were underneath all along, behind the mask of green and/or their colors also reveal what has been stored up or trapped in the leaves when the supply of nutrients ceased. Trapped sugars pr...