Widely used as a shade tree (not to mention for tapping maple syrup), this U.S. native with the hand-sized leaves can grow 50 to 60 feet tall and wide. Fall color: glowing burnt orange. Red maple ...

"It is so big that when you're inside the tree, people walk by and they don't even know that you're in it," Scot Wineland ...

PENNSYLVANIA (WHTM) — It is now officially spring, which means Pennsylvania’s trees will soon be green. Some have already started sprouting tiny buds that will grow into leaves in no time.

You can find Pennsylvania's big tree list, go visit them, and even get involved by learning how to measure trees so you can nominate a tree you know for champion status at this link: PaBigTrees.com.

The Maryland Department of Agriculture announced there are worsening conditions of beech leaf disease in the state.

If the only time you notice trees is now, when their leaves change color, ... Pabigtrees.com, and editor of Big Trees of Pennsylvania, just out in an updated 2011 edition.

Pennsylvania naturalists are keeping an eye on a disease that has been killing beech trees in the eastern U.S. for more than a decade, but has begun spreading more rapidly in the past three years.

But you can also still notice it in the fall, the oak tree that has shed its leaves long before the others. Oak wilt is showing up in places around western Pennsylvania.

The big event’s timing is determined by changing chemistry in the tiny abscission zone, a narrow band of cells at the base of each petiole, or leaf stalk, where it attaches to the stem or branch.