It will be another year at least before Canadians can grow their own marijuana. Following Royal Assent, the Liberal government intends to bring the proposed Act into place no later than July 2018, announced Health Canada. At that time, adults would legally be able to possess up to 30 grams of legal cannabis in public, and grow up to four plants per household at a maximum height of one metre from a legal seed or seedling. But, warns Health Canada, Until the new law comes into force, cannabis will remain illegal everywhere in Canada, except for medical purposes. But if you're renting your home, you may have to think again. The national landlord group Canadian Federation of Apartment Associations says the federal government should change its proposed marijuana legislation bill to ban people from growing plants in rented homes of multi-unit buildings.