The vast majority of forest restorations contain just one tree species—leaving them vulnerable to pests like the emerald ash ...

We may receive a commission on purchases made from links. Canopy trees form the tallest layers in a forest or woodland, and are usually at least 30 feet tall, hanging over understory trees, shrubs, ...

Add Yahoo as a preferred source to see more of our stories on Google. Over the last few years, I and other people I know in the tree business have noticed an increase in concern about trees doing ...