The 25 mile rule for growing never would have lasted anyways. either everyone can grow or nobody can grow, they can not create special protections for some residents while not providing that same protection to others.
14th Amendment
Amendment XIV
Section 1.
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside. No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law;
nor deny to any person within its jurisdiction the equal protection of the laws.