Saguaro National Park staff refer to it as the archenemy of the Sonoran Desert. Buffelgrass is an invasive weed that poses a double threat to saguaros and other native plants. First, it competes with ...

This section of the Sonoran ... native plant species, such as saguaro, cholla, mesquite and palo verde trees, and ocotillo. Hike on the park's nine scenic trails or take a drive on the 21-mile Ajo ...