(a) Except for enforcement provided under § 8–803.5(g) of this article, the Department has the exclusive authority to establish standards regulating fertilizer and its application to turf. (b) A local government entity may not adopt laws, regulations, rules, ordinances, or standards regulating fertilizer and its application to turf. (c) Subsections (a) and (b) of this section do not exempt a person from complying with any provision of, or any regulation adopted in accordance with, the Environment Article.
Maryland Legal Code