No person shall distribute an adulterated product. A commercial fertilizer or soil conditioner shall be deemed to be adulterated:
(a) If it contains any deleterious or harmful ingredient in sufficient amount to render it injurious to plant life when applied in accordance with directions for use on the label, or if adequate warning statements or directions for use, which may be necessary to protect plant life, are not shown on the label.
(b) If its composition falls below or differs from that which it is purported to possess by its labeling.
(c) If it contains unwanted crop seed or weed seed.