The big dawn redwood tree outside my office window is now orange and is beginning to drop its branches. Unlike true conifers, dawn redwoods are deciduous, meaning they lose their needles in the fall ...

We look at the threats facing trees around the world, along with new efforts to save them — and help them survive and thrive.

Orchids, known for their flamboyant petals, deceptive mimicry and fascinating lifestyles, have captivated biologists and horticulturists for centuries. With nearly 30,000 described species, they form ...