"Amount reasonably required" is determined on a case-by-case basis. Some patients need more than others. Also, ingestion method is an important variable. People who cook with cannabis usually need more than people who inhale, whether smoking or vaporizing. Then the whole issue of potential yield in a grow case comes up. The cops usually testify to ridiculous numbers, often claiming a 2 ft. tall indoor plant puts out a pound, and you can cut it and have it grow back three times! I've had a cop testify that 40 three inch clones grown in a two by two tray will yield 120 lbs.! In actuality, regardless of the number of plants, if the grow is in a 2x2 tray, it will yield approximaely two ounces, not 120 lbs.
Bill, tgo