Cal. FAC § 14631

Every lot, parcel, or package of fertilizing material distributed into or within this state shall have attached to it, or the shipment shall be physically accompanied by, a label as required by the secretary, by regulation. The secretary may require proof of labeling statements and claims made for any fertilizing material. As evidence of proof, the secretary may rely on experimental data, evaluations, or advice furnished by scientists, including scientists affiliated with the University of California, and may accept or reject additional sources of proof. The secretary shall cancel the approval of, or refuse to approve, a fertilizing material label if the secretary determines that adequate proof of label claims does not exist. The secretary, after hearing, may cancel the license of any person who distributes a fertilizing material with a label for which approval has been canceled or a label that has not been approved by the secretary.