Green House Seed Company - The World's Leading Cannabis Seed Bank, The Green House Seed Company is one of the most successful cannabis businesses in the world, credited with winning over 40 High Times Cannabis Cups and many other awards in the industry. Arjan, the owner of the Green House, always had a vision to normalise cannabis all around the world, for both medicinal and recreational use. Since opening the first Green House Coffeeshop, Arjan has established an empire of cannabis businesses, with 4 cannabis coffeeshops in Amsterdam, one cannabis social club.