Md. Code, Land Use § 8–103

(a) The preservation of a designated structure under this title includes preservation of an associated:

(1) natural land formation; and

(2) appurtenance and environmental setting.

(b) This title may not be construed to prevent routine maintenance, customary farming operations, or landscaping that does not have a material effect on the historic, archaeological, or architectural significance of a designated site, structure, or district.