Not only was it the nation's largest cottonwood for many years, it was Arizona's largest known tree of any size, said Ken Morrow, the state coordinator for the national big tree program.

PHOENIX — Amid the Arizona heat, researchers are finding Fremont Cottonwood trees can cool themselves down, but their survival depends on consistent water access. The trees essentially sweat ...

These trees like wet conditions and ... known as the western cottonwood or the Rio Grande cottonwood, occurs in California east to Utah and Arizona and south into northwest Mexico.

If you’ve been outside lately, you may have noticed white fluff drifting through the air. That’s cottonwood—and it’s making quite the fluffy entrance this season.

Cottonwood trees are emblematic of the American Southwest ... A recently published study co-authored by Northern Arizona University researchers shed new light on how cottonwoods cope with ...

A 105-foot cottonwood tree that was cut out of a Billings backyard last week might have some life left in it. When news of the tree’s demise reached Marty Flanagan, he knew he wanted a piece.

Between the warm weather and healthy amounts of rain that the Bozeman area has seen, the entire town is completely covered in ...