Medical marijuana patients will soon be able to join collective gardens in Vancouver.   The gardens can have up to 10 patients, as many as 45 plants and have to be located in light or heavy industrial areas.  Mayor Tim Leavitt says law enforcement officials he's talked with say it's the right direction to go.  The collective gardens have to register with the state and keep records of medical marijuana patients.  They can't have outside signs and they can't sell marijuana or items used to smoke marijuana.