Cal. Bus. & Prof. Code § 26227

An association may engage in any activity in connection with the growing, harvesting, curing, drying, trimming, packing, grading, storing, or handling of any cannabis product that is produced or delivered to it by its members; or any activity in connection with the purchase, hiring, or use by its members of supplies, machinery, or equipment, or in the financing of any such activities; or in any one or more of the activities that are specified in this section with a valid license.