If you thought the ancient evergreens at California's Big Basin Redwoods State Park were old, the state's bristlecone pines ...

Pitch Pine Pitch pine trees (Pinus rigida) grow along the eastern North American coast and as far south as northern Georgia. This species thrives in a humid climate and on sandy, shallow soils.

In a Swiss pine forest, the treetops are being sprayed with mist in a bid to discover the effect that drier or wetter air has ...