Saguaro cacti grow one inch every 10 years. Imagine how long it takes to get 40-60 feet tall and weigh up to 16,000 pounds! Even after it was given to the national park service, cattle continued to trample the young saguaros. To protect the cacti, Saguaro finally became a national park in 1994, the only one in Arizona. And now we can all appreciate this symbol of the American Frontier.