duh, ok here i found it, it was right on top of the severability clause:
Section 5: Amendment
Pursuant to Article 2, section 10(c) of the California Constitution, this Act may be amended either by a subsequent measure submitted to a vote of the People at a statewide election; or by statute validly passed by the Legislature and signed by the Governor, but only to further the purposes of the Act. Such permitted amendments include but are not limited to:
(a) Amendments to the limitations in section 11300, which limitations are minimum thresholds and the Legislature may adopt less restrictive limitations.
(b) Statutes and authorize regulations to further the purposes of the Act to establish a statewide regulatory system for a commercial cannabis industry that addresses some or all of the items referenced in Sections 11301 and 11302.
(c) Laws to authorize the production of hemp or non-active cannabis for horticultural and industrial purposes.
so the legislature can make it a more liberal bill, but can't restrict it, makes sense