Whenever a weed and grass control nuisance exists upon any property, a City official may serve notice upon the owner, owner’s agent, or occupant of the property to abate the nuisance within forty-eight (48) hours or within a stated longer period if the City official determines it necessary to avoid undue hardship. Such notice shall be made by one of the following methods: posting the notice in a conspicuous place upon the premises where the nuisance exists, U.S. certified mail, or regular U.S. mail service. Any subsequent violation within the same calendar year may be abated without further notice.