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Oregon Medical Marijuana Grower Laws. How much medical marijuana can I grow? The laws in regards to growing are very straightforward; you cannot grow more that 6 mature plants and 18 seedlings at any one time. A seedling is a plant less that one foot tall or wide and a mature plant is anything over 1 foot. There are no specific laws saying how big a mature plant can get either. Once the plants are harvested you will want to make sure you have only 24 ounces of usable marijuana. A grower:
In fall 2012, Washington State and Colorado were the first states to legalize a small amount of pot for personal recreational use. States vary on how much pot, or marijuana plants, you can have on hand for your own medical use, from one ounce up to 24 ounces in a few states.In 15 of the 18 states patients and/or their caregivers can cultivate plants to grow their own at home.REUTERS/Jonathan Alcorn). Lorie A. Parch is a Los Angeles-based writer specializing in health and lifestyle topics. If youâve ever used medical marijuana to treat, say, a bad back or sick-as-a-dog nausea, you may have wondered how the collectives and dispensaries that sell medically sanctioned weed are actually run.