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Breeding is the process of crossing cannabis plants to produce desirable unique traits. Breeding creates a new strain of cannabis that can be unique to its breeder. Cannabis breeding began in the 1970s for the purpose of creating new strains and increasing the potency of cannabis. In the 1970s a typical cannabis plant contains 3 to 5% of THC, which is Now increased to 17 to 25% in modern strains thanks to breeding. Many breeders use breeding to create unique strains of Marijuana to stand out among competitions. Once the genetics of a new strain has been stabilized, their seeds can be sold to individuals looking to grow a similar crop.