Why Do Trees Lose Their Leaves in the Fall?

Climate factors result in falling leaves every autumn.

Leaves changing color and blanketing the ground with vibrant oranges, reds and yellows highlight the fall season. This change represents a natural process as trees prepare for the winter season.

Significance

The reduced amount of daylight during the fall season coupled with the drop in temperatures prompts the food-making process of trees to shut down. This results in chlorophyll, which provides the green coloring for leaves, breaking down and giving way to other colors present in leaves such as orange and yellow.

Effects

A layer of cells develops at the base of the leaf's stem that begins to break the tissue bond that attaches the leaf to the tree. This process causes the leaves to gradually start falling off the tree over the course of the season.

Considerations

In warmer climates, such as in the South, some leaves may retain their green color and stay on trees. A variety of factors, including temperature, water and light can affect the brilliance and duration of fall color.

References

• Science Made Simple: Why do Autumn Leaves Change Color in the Fall?
• State University of New York College of Environmental Science and Forestry: Why Leaves Change Color