Cleistocactus strausii
Silver Torch cactus can thrive in low-nitrogen soil without facing the consequences of low nitrogen. Too much water will make the plant weak and lead to root rot. 
Least Concern. This cactus is locally abundant in its native land and has few local threats to its survival.
This cactus can be propagated by cuttings or seed.
Cactus plugging
Cactus plugging is the practice of vandalizing or destroying a cactus, usually a saguaro, for fun. The Extension Office of the University of Arkansas says that the activity usually involves an inebriated person shooting at a cactus until it falls over.