the giant weber's agave
The enormous Weber's agave (Agave weberi) is often seen in the southwestern United States and parts of Mexico, but only in cultivation, as there do not appear to be any wild specimens left. It was originally from Tamaulipas and San Luis Potosí.
This specimen plant can grow about 6 feet tall and stretch out to about 10 feet wide, with numerous pups. Greenish blooms appear at the end of its life rising above on a 20-foot tall stalk--like all agaves, Weber's agave will die after blooming, as all leaf and root resources are put into the stalk, flowers, and seeds. The pups will continue to grow and live.
Agave snout weevil (Scyphophorus acupunctatus) will attack several agave species, especially the Weber agave, in the low desert. The agave weevil will cause weber agave to die and rot. The smell from the rotting cortex can be detected from quite a distance.
Plant in well-drained soil. This is a low-water succulent but likes some additional water in the summer. Weber's agave is best in full sun (top zone).
Weber's agave is relatively more frost tender (compared to other agaves) suffering damage at about 25º F. but can survive temps down to 10º F.