|Photo by Allison Waibel 1/8/2014|
You often see saguaros of the same relative size in a group like this (called a cohort). If saguaro seeds fall (i.e., get pooped out) in a good location (e.g., under a mesquite tree) at a good time, they may sprout. If the sprouts don't get eaten, trampled, fried, or frozen, they may just make it past the first decade. If they make it past the first decade, (and most do not) they may make it another decade.
What can we say about this cohort? Most are at least 50 years of age.