Notwithstanding subdivision (b) of Section 58889, effective immediately, a marketing order may contain provisions for the establishment of plans for advertising and sales promotion, including any private brand or trade name, to maintain present international foreign markets or to create new or larger international foreign markets for any commodity which is grown in this state, provided that effective January 1, 1978, such advertising and sales promotion plans require that each individual commodity package label indicate the commodity is of California origin in English or other appropriate language.