A: As a tree gets older, the woody tissue of the trunk and limbs divides into two zones: heartwood and sapwood. Heartwood cells usually contain tannins or other substances that make it dark colored ...

One of the costliest losses in the landscape is when an animal destroys or disfigures a new tree. A new tree can easily cost $100 these days for even a small one, and they’re particularly vulnerable ...

Perhaps you’ve wandered through a forest or strolled into a neighborhood park and found tree trunks — and wondered if counting the rings on a trunk is truly a way to know the tree's age. "Most of us ...

Perhaps you’ve wandered through a forest or strolled into a neighborhood park and found tree trunks — and wondered if counting the rings on a trunk is truly a way to know the tree’s age. “Most of us ...

Foresters and researchers are using sound to look inside living trees. A new study presents methods for use of sonic tomography, which measures wood decay by sending sound waves through tree trunks.