A couple walks underneath vibrant trees in Palo Alto during the fall. File photo ... to be happening. Some color changes and leaf dropping can be signs of an unhealthy tree. Normal seasonal ...

The tree intentionally drops the leaves to prepare for winter. And the changing of the colors of the leaves ... however. Ash and oak, for example, have no anthocyanin, and turn bright yellow in autumn ...

Oak and hickory tree leaves tend to produce orange ... But the thing that shuts down fall color is a hard frost. If you get a big freeze, everything just kind of stops. But if we do stay in ...

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 ...

Veinal necrosis causes leaves' veins to change color all over the tree. First, check the health of the live oak. Jones said anyone ... turn brown until after they fall on the ground.

This phenomenon, called marcescence, adds a unique dimension to the winter landscape, and gives me something to ponder while ...

Oak galls are popping up everywhere this fall! They're the tiny, fuzzy yellow or brown balls on oak leaves and branches. You ...

By Cliff Johnson Carver/Scott Master gardener In the late 1940s, thousands of soldiers returned from WWII and immediately set about buying homes and producing children (i.e., the “baby boom”). The ...

Read Dr. Don Leopold's Guide to Fall Colors in Upstate New York with color images of dozens of trees and shrubs. Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, ...