Rincon Mountain District Backcountry Closures Due to Deer Head Fire
For the safety of hikers and campers, some trail and campground closures have been enacted. All off-trail areas within Saguaro National Park east of Douglas Spring Trail and Manning Camp Trails are also closed. More »
Why saguaros have pleats
Because the majority of a saguaro is made up of water, an adult plant may weigh 6 tons or more. This tremendous weight is supported by a circular skeleton of inter-connected, woody ribs. The number of ribs inside the plant correspond to the number of pleats on the outside of the plant. As the saguaro grows, the ribs will occasionally fork and the corresponding pleat will also fork at the same place.
Sometimes saguaros have the chance to soak up a larger than usual amount of water - such as after a large summer rainstorm. The ground can become very soft after such a storm and with the added weight of the new water, the heavy cactus sometimes fall over or lose an arm.
Layers of a saguaro:
epidermis (green part)
cortex or pulp
ribs (with corresponding pleat on surface)
pith (inside the ribs)
Did You Know?
Buffelgrass burns at 1300-1600 F, hot enough to melt aluminum and the fire can travel near the speed of the wind. Even in moderate weather, it can travel at 2-3 mph with 12-18 ft flame lengths, making it a real threat to the lives of firefighters