Food & Agr. Code, § 55631

(a) Every producer of any farm product that sells any product that is grown by him or her to any processor under contract, express or implied, in addition to all other rights and remedies that are provided for by law, has a lien upon that product and upon all processed or manufactured forms of that farm product for his or her labor, care, and expense in growing and harvesting that product. The lien shall be to the extent of the agreed price, if any, for that product so sold. If there is no agreed price or a method for determining the price that is agreed upon, the extent of the lien is the value of the farm product as of the date of the delivery. Any portion of that product or the processed or manufactured forms of that product, in excess of the amount necessary to satisfy the total amount owed to producers under contract, shall be free and clear of that lien.

(b) Every producer of a flower, agricultural, or vegetable seed that sells seed that is grown by him or her, when the seed was purchased or supplied by the grower and not supplied by the dealer or an independent third party who paid for the seed, to any seed dealer under contract, express or implied, in addition to all other rights and remedies that are provided for by law, has a lien upon that product and upon all processed or manufactured forms of that product for his or her labor, care, and expense in growing and harvesting that product. The lien shall be to the extent of the agreed price, if any, for that product so sold. If there is no agreed price or a method for determining the price that is agreed upon, the extent of the lien is the value of that product as of the date of the delivery. Any portion of that product or the processed or manufactured forms of that product, in excess of the amount necessary to satisfy the total amount owed to producers under contract, shall be free and clear of that lien.