Fall Foliage Facts

October 4, 2010

The amount of daylight (photoperiodism) prompts the color changes in leaves, not cooler temperatures. As days get shorter, trees use less chlorophyll. All that green pigment starts to degrade, revealing the other leaf pigments. Trees with leaves that always turn yellow include tulip poplar, birch, hickory, and redbud. Some trees have leaves with high amounts […]

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