What Causes Leaves To Change Color?

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What Causes Leaves To Change Color?

Ever wonder why leaves really change color each fall?

We checked in with a real “fall guy,” Appalachian State University Biology professor, Howard Neufeld, who has been studying fall color for much of his career, to get the answer. His scientific interest in what occurs inside a leaf has naturally progressed to what shows outside, and when. Neufeld‘s research and sociability have made him a go-to guy for fall color science and forecasting. So what does he say about why leaves change color? What signals them to change?

Inside A Leaf
The vivid, often simple colors on the outside are the products of the complex chemistry of growth inside a leaf. Take the yellows and oranges, for example—the dominant colors of aspen, ash, birch, beech, hickories, maples, some oaks, tulip poplar, and sassafras—generally, these colors come from compounds called carotenoids (also responsible for the color of carrots) which are present…

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