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Why do leaves change color in the Fall? What if my tree turns colors earlier than other trees - could this be a problem?

In many parts of North America and the world, people enjoy one of nature's finest shows: Fall foliage.

Leaves can be thought of as small factories containing raw materials, products and by-products, all in chemical form and some with color. As the leaf is "abandoned" by the tree, the green chlorophyll--the dominant chemical found in most leaves--is broken down and "recycled" by the tree, leaving behind other-colored chemicals. Supply lines to the leaves also become clogged. If the major chemical remaining in the abandoned leaf is red, then the leaf turns red. If itís yellow, then the leaf turns yellow, and so on.

The yearly variation in color intensity is due to varying weather conditions, which can affect the balance of chemicals and their composition in the leaves. Differing amounts of rainfall, sunlight, temperature, humidity and other factors may have an effect on how bright, how quickly and how long the "leaf-peeping" season will be in any given year.

Pre-mature fall coloration

Color-changing leaves make for a beautiful display, but early changes in leaf-color can be a sign that your tree is stressed and is susceptible to insect and disease attack.

If the leaves on your trees seem to have gotten a jump-start on fall compared with those on similar trees in the area, then you might want to consult a professional technician, who can identify any problems and offer possible solutions.

Premature colors can be an indication that a tree isnít vigorous enough to withstand insects and disease organisms that may attack it, not to mention the usual changes that occur when the weather turns cold. Occasionally only one or two limbs of the tree will show premature fall color. This could be a sign of a disease at work, weakening only the infected limbs. The more common situation is for the entire tree to exhibit premature fall coloration, a phenomenon usually linked to root-related stress. Trees respond to these stresses by trying to curtail their above-ground growth.