This sativa-dominant Cannabis strain is one of those strains that you grow and never want to look back. Yes, I am talking about the Calvin Cannabis strain. The Calvin strain attributes its traits to the parentage that the breeder chose to use. These include the following three strains that were crossed together to yield the Calvin strain: the California Orange strain, the Switzerland strain as well as the Lebanese strain. He Breeder who developed this strain is known as the BlueHemp Switzerland ...