The California supreme court has already ruled that there is no limit to what medical users and caregivers can grow.

California Supreme Court Bolsters Protection For Marijuana Users : Shots - Health News Blog : NPR

Prop 19 has no effect on 215, 420, or that court ruling. Medical growers can grow as much as they want to. It's already the law.

Medical marijuana profiteers are unhappy that anyone who wants to could grow their own, now, and they wouldn't need a medical card or have to buy from a dispensary.

Anyone 21 or older could possess weed, pipes, etc., and not worry about getting arrested. Bars, coffehouses, or any other businesses could legally sell weed to adults.

This will hurt sales of medical weed because many (if not most) cardholders are recreational users, and don't need marijuana for health reasons.

That's why they're crying. Their little monopoly is about to get smaller if 19 passes.

Want to grow more than a 5x5 plot? Keep your medical card current. Voila! Problem solved!