Saguaro
Cereus giganteus
The dominant plant of the Tucson area and the symbol of the State of Arizona. This cacti towers over 40ft (12m) over the desert, sometimes a lone sentinel, or often thick stands creating a cacti forest. The Saguaro defines the upper Sonoran Desert both to the scientist and the layman. The saguaro is
surprisingly fragile for such a large plant. The seedling saguaro must
start in a spot sheltered from the desert sun, which can heat the ground
surface to over a deadly 150 degrees F (65 degrees C). The shade of
a "nurse plant" or a rock provides the usual location. Without
this protection the saguaro seedling would probably not survive. The
saguaro will the grow many years as a straight pole. A few decades later
the first arms might appear. A mature, multi armed saguaro might live
several centuries. Frost, lightning and man are the primary dangers
to a mature Taken from Andrew Cooper's cactus website |