Tony Paniagua takes us to Sabino Canyon, where biologists have discovered another invasive species.

While Buffelgrass remains a problem, so-called "Giant Reed" can grow as high as 20 feet, spread rapidly and clog stream beds.

Tucson Arundo, is looking for students, citizen volunteers, and civic and professional organizations (scouts, 4-H, Audubon, Rotary, etc.) who are interested in volunteering to help remove this invasive plant.

This fall, the U.S. Forest Service will be training volunteers to remove the giant stalks.