The department may issue a special commemorative "Keep South Carolina Beautiful" motor vehicle license plate for use by owners on their private passenger motor vehicles to establish a special fund to be used by the Department of Transportation for the purposes of beautifying the state's roads and highways. The Department of Transportation, in implementing this program, may not expend beautification funds for wildflowers without prior approval of the South Carolina Department of Agriculture. The Department of Agriculture shall ensure, before granting approval, that the varieties of wildflowers used in beautification are not harmful to agriculture at or near a proposed project. The biennial fee for the commemorative license plate is fifty-four dollars, and of this amount twenty-four dollars must be placed in a special "Keep South Carolina Beautiful Fund" established within and administered by the Department of Transportation. This biennial fee is in addition to the regular motor vehicle registration fee set forth in Article 5, Chapter 7 of this title. The commemorative plate must be of the same size and general design of regular motor vehicle license plates and must be imprinted with the words "Keep South Carolina Beautiful". The plates must be issued or revalidated for a biennial period which expires twenty-four months from the month they are issued.