Some people with sensitive skin may also develop itchy spots from the pine needles poking their skin, Wada said. Why your fake Christmas tree may irritate you. Fake Christmas trees are more likely ...

The oldest tree species is the Great Basin bristlecone pine, with many trees dating back around 4,000 years. The oldest tree is named Methuselah and it dates back nearly 5,000 years.

The whitebark pine is a hardy tree that grows in an area stretching from British Columbia, Canada south to parts of California and east to Montana. It's a keystone species in its subalpine and ...