Hence, we often call the season "fall." Biologically speaking ... and purple colors of autumn -- are unmasked. The yellow-orange colors in leaves in the autumn are caused by pigments known as ...

This tree, native to the northeastern United States and southeastern Canada, is renowned for its spectacular fall color that ...

Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer ...

“Some of them are yellow, some of them are red, depending on the tree,” she added. Cooler temperature also impacts the timing and brightness of fall leaf colors. “The colder it ...