This 30-year-old orange tree named Donaldson may hold the cure for the disease now decimating Florida’s citrus trees.

When Americans think of fresh orange juice, they probably picture a glass poured straight from Florida’s sun-drenched groves. But for two decades, the state’s citrus industry has been under siege by a ...

A new analysis reveals that many of Eastern Oregon's ancient trees are dying at an alarming rate. The study, conducted by a ...

Trees take centuries to respond to change. But climate change is moving much faster, and forests may not survive the gap.