Here's a great reference guide to dosages and yeild sizes per number of plants and square feet of garden space.

http://www.safeaccessnow.net/pdf/can...dosage-rgb.pdf

Also, you can get a form to submit with your application so that your doctor can recommend that you can legally have more plants than the default limit of six, so that you can medicate yourself appropriately to meet your needs.

It's helpful if you bring a copy of that PDF along with you to your doctor if you're trying to get him or her to sign your application for more additional plants, to provide some scientific justification for your request.

The federal government provides a very few people with marijuana cigarettes for medical purposes due to a federal program that was shut down early in the 70's. These people now get about 300 joints per month issued and pre-rolled from the federal government, which sets a scientific precedent for comparable dosages for state patients. It works out to something like an ounce per week, or a little more than an 8th per day. All that is described in the PDF above, Cannabis Dosage and Yield

So in the context of Colorado this means the legal limit of two ounces is a two week supply and in order to maintain that supply one needs to have a garden producing a continuous supply of 2 ounces every two weeks since the person cannot possess more than 2 ounces or a two week supply at once. Therefore, many patients really must have more than six plants in order to meet their medicinal needs, unless they are going to be harvesting a 2 oz plant every two weeks and somehow keep the cycle going individually with six plants.