(a) Notwithstanding any other provision of law, it is lawful and shall not be a public offense under California law for any person 21 years of age or older to:
-snip-
(ii) Cultivate, on private property by the owner, lawful occupant, or other lawful resident or guest of the private property owner or lawful occupant, cannabis plants for personal consumption only, in an area of not more than twenty-five square feet per private residence or, in the absence of any residence, the parcel. Cultivation on leased or rented property may be subject to approval from the owner of the property.
-end excerpt-
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You said Prop 19 "would prevent ALL private growing and require the possessor to prove they purchased from a legal grower (and thus paid the tax) on the spot." The above excerpt seems to contradict your assertion. Can you copy and paste the "fine print" that you say backs your claim?
I should have specified: all private growing without paying the tax, which is what the home-growers thought they were getting.