Charges of growing any number of marijuana plants are taken serious. Growing even one marijuana plant can result in felony charges and up to four years in prison. The larger the number of plants, the higher the potential sentence can be. If you are a registered patient under Michigan’s medical marijuana act, or a registered caregiver in certain circumstances, you are allowed to own up to 12 plants. However, even conduct that is permitted under Michigan law may not be permitted under federal law. These are complex issues and if you have been arrested, you should consult with an attorney to explain your options.