The saguaro cactus had ... expand like accordions as the cactus swells. It is this adaptation that makes the cacti susceptible to frost, as the water in the saturated limbs can freeze. A Pulitzer ...

Photo: Mario Tama (Getty Images) Start Slideshow One of the Southwest’s most familiar plants may be in deep trouble. The towering, multi-armed saguaro cactus, which is found only in the Sonoran ...

Find a photo op at the entrance of Saguaro National Park ... From Ironwood to the Pinkflower hedgehog cactus, the desert offers a striking landscape. To the first-time visitor, the desert might ...