Cal. Health and Safety Code § 11018.5

(a) (1) “Industrial hemp” or “hemp” means types of the plant Cannabis sativa Linnaeus or any part of that plant with a total tetrahydrocannabinol concentration of no more than 0.3 percent on a dry weight basis and is limited to only agricultural products, including seeds, propagated plant material, immature or mature plants, harvested plants, mature stalks of the plant, fiber produced from the stalks, oil or cake made from the seeds of the plant, or any preparation that does not contain cannabinoids. (2) Total tetrahydrocannabinol concentration includes both delta-9 tetrahydrocannabinol and tetrahydrocannabinolic acid, and shall be calculated using the following equation: Total THC concentration (mg/g) +/- the measurement of uncertainty, as defined by the Department of Food and Agriculture. (b) Industrial hemp shall not be subject to the provisions of this division or of Division 10 (commencing with Section 26000) of the Business and Professions Code, except upon entry into the California licensed market under that division, and shall be regulated by the Department of Food and Agriculture in accordance with the provisions of Division 24 (commencing with Section 81000) of the Food and Agricultural Code, inclusive. (c) The sale or delivery of hemp flower and hemp prerolls within the state is prohibited.