SECTION 1. Section 7 of chapter 94G of the General Laws, as appearing in the 2016 Official Edition, is hereby amended by striking subsection (2) and inserting in place thereof the following subsection:-

(2)  within the person’s primary residence, possessing up to 2 ounces of marijuana and any marijuana produced by marijuana plants cultivated on the premises and possessing, cultivating or processing not more than 6 marijuana plants per residence, no more than 3 of which may be mature, flowering plants.

(i) A municipal government may enact and enforce reasonable by-laws or ordinances to regulate the home cultivation of marijuana to ensure such home cultivation does not exceed legal limits and does not negatively impact public health or safety.

(ii) In conjunction with the department of agricultural resources, the department of environmental protection, the department of public health, and the executive office of public safety and security, the commission shall publish guidelines on the safe cultivation of marijuana on personal property.