Here is the definition of a caregiver
(J) “Personal caregiver” shall mean a person who is at least twenty-one (21) years old who has agreed to assist with a qualifying patient’s medical use of marijuana. Personal caregivers are prohibited from consuming marijuana obtained for the personal, medical use of the qualifying patient.
So the language used us assist. This may mean obtain, buy, grow, prepare, administer etc. Something to be clarified. But the way I see it if your patient is unable to obtain access to a dispensary because of transportation, finincial or other proven burden then the caregiver may cultivate. The other ways to become a legal grower would be to become a patient oneself and prove a burden or obtain a registration certification from the state to operate one of the few dispensaries.
Here is the deal so long as there are no dispensaries open, caregivers and patients will not only be allowed to grow but they will be forced to in order to supply their medicine. So its up to see what happens if people want to grow at home then oppose the opening of dispensaries or try and find a way to prove an undue burden. They also have yet to determine the number of allowable plants.