Maryland Code, Real Property § 8-115

(a) If a share of growing crops is reserved as rent, the rent reserved is a lien on the crops.

(b) In Calvert, Charles, Prince George's, St. Mary's, and Worcester counties, if a share of growing crops is reserved as rent, or advances by the landlord are made on the faith of the crops to be grown, the reserved rent and advances made are a lien on the crops. However, the contract making the advances shall be written and executed by the landlord and tenant.

(c) Any lien provided for by this section is not divested by sale by the tenant, the personal representative of a deceased tenant, by the assignment of the tenant in bankruptcy or insolvency, or by process of law.