RE:Homegrow Numbers from Health Canada The 4 plant limit is only for rec. Patients can grow a lot more and it has to do with how many grams they're prescribed per day. So it's likely that the number of plants each patient is growing can in the dozens at least from what I've heard from patients who grow their own. Also, take into account people who grow for others, they can grow more if it's for more than one person.