Why do leaves change color?

Leaves change color because of a process called senescence, which is a natural part of a plant's life cycle. As the days become shorter and temperatures drop in the autumn, the production of chlorophyll, the pigment responsible for the green color in leaves, slows down and eventually stops. This allows other pigments, such as carotenoids (which produce yellow and orange colors) and anthocyanins (which produce red and purple colors), to become more visible. The combination of these pigments gives leaves their vibrant fall colors. Additionally, as the chlorophyll breaks down, nutrients are reabsorbed by the tree before the leaves eventually fall off.

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