Maryland Code, Local Government § 13-408

(a) The County Commissioners of Washington County may adopt regulations for restricting the growth of nonnoxious weeds on real property in Washington County.

(b) The County Commissioners of Washington County may provide that unpaid charges made against real property for the removal of an unauthorized accumulation of weeds and debris from the property are a lien on the property until paid.

(c) The County Commissioners of Washington County shall provide reasonable notice to the property owner that a lien may be imposed under subsection (b) of this section before the removal of weeds or debris from the property.