I believe you are misinformed. Taxation would be left up to local governments if they choose to license sales, and it would be legal to grow your own on a 5'x5' area on your property.
What is the source for your claims?
The fine print in Prop 19, and a very interesting discussion on "Cannabis Nation", on KOFY TV 20 (hippie TV) a rabidly pro pot TV program.
A young woman spoke very articulately on the legal wording of the proposition and how California courts have already ruled on similar wording in other law.
This gal was no glassy eyed pothead, and pointed out how 19 could be applied by a judge that wanted to collect money for the state. We got any of those around?