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.
Decriminalization of non-medical cannabis in the United States
Ecosystem: A single mature marijuana plant can consume 23 liters of water a day, compared to 13 liters for a grape plant. Historically, many outdoor cultivators have used illegal river and lake diversions to irrigate crops. These diversions have led to dewatering of streams and rivers which is well documented in areas of Northern California. As with any other agricultural crop, increase in demand leads to increased clear cutting of forests which can increase erosion, habitat destruction, and river diversion. Legalization and subsequent regulation could mitigate such issues.