Why the Leaves Change Color

With fall officially underway, the leaves on many varieties of deciduous trees are starting to change color in northern climes. Why? Because chlorophyll production is declining, and as a result, the leaves lose their green color and reveal their true underlying color, says SmokyMountains.com. Beta-carotene produces orange leaves, anthocyanin produces reds and flavonols yellows. To protect themselves from winter’s harsh temperatures, perennial trees cut off leaves’ supply of water and nutrients to hibernate.