 CLS Holdings is a vertically integrated cannabis producer and retailer The company owns two subsidiaries - Oasis Cannabis dispensary, and City Trees manufacturing facility City Trees can produce 1.7 million in revenue every month What CLS Holdings Does: Cannabis Life Sciences, or CLS Holdings USA CSE:CLSH, OTCQB:CLSH, Inc is a vertically integrated cannabis producer and retailer dealing with a range of products through its subsidiaries in Nevada. The Las Vegas-headquartered company owns a dispensary. 