The yellow-orange colors in leaves in the autumn are caused by pigments ... in such high quantities that the trees have a red or purple leaf throughout the summer. Not all trees have anthocyanin, ...

The question of the week from the Minnesota Department of Natural Resources (DNR): Q: Why do trees change color in the fall and what determines if we have a good display on a given year? A: Those ...

A simple blue stain could force trees into giving up their memories of cold summers and volcanic winters, a recent study reveals, giving researchers a new way to precisely reconstruct ancient climates ...

says ODNR's fall color forester David Parrott. "Ohio has experiences a very dry summer and early fall, which has led to some ...