Every landlord shall have a lien upon the crops grown on the demised premises in any year, for the rent that shall accrue for such year, and such lien shall continue for eight months after such rent shall become due and payable, and no longer. When the demised premises or any portion thereof are used for the purpose of growing nursery stock, a lien shall exist and continue on such stock until the same shall have been removed from the premises and sold, and such lien may be enforced by attachment in the manner herein provided.