



The giant Saguaro is an icon of the American southwest and so are beautiful sunsets. Together these two icons make a beautiful image. My camera has been able to capture this image several times this past week and I have one more chance to get my best sunset image yet. Saturday we drove across Tucson to Saguaro National Park East enjoying a 6 mile drive through the park. We noticed there were not nearly as many saguaro cacti in this park as there are in Saguaro Park West just down the road and around the corner about 6 miles from the casita where we are staying. The reason is there have been several freezes in that area and freezing weather does a number on the saguaro. In fact, the saguaro which have ridges around the cactus show signs of damage including freezing temperatures. The most important factors for growth is water and mild temperatures. The cacti can hold 70% water in the inner reeds which run through the plant from bottom to top and live on this water for a long time until the summer and winter rains. Many of these cacti can live 150-200 years and at 10 years old may only be 1.5 inches tall. Some saguaro can grow 40-60 feet tall and have up to 25 arms. We counted 13 arms which was a record that we saw. The root system extends 4-6 inches deep but as wide as it is tall. The main tap root can extend more than 2 feet. The seeds of the flowers on the top of the cactus are carried by birds, deposited under the trees where the birds roost and then the seeds germinate and little off white puff ball type things (much like cotton balls) start growing using the shade of the other tree as protection. We saw many of these new saguaro plants and as they grow the shade tree and the saguaro either co-exist or one of them wins the race and the other one dies off.