Lawn fertilizer, like all plant fertilizers, never goes bad and, theoretically, lasts forever. Tightly seal the container and store in a dark place, like a garage. If it gets hard, break apart with hammer.
About this Author
Thomas K. Arnold is the publisher and editorial director of "Home Media Magazine" and a regular entertainment contributor to various publications including "USA Today," "The Hollywood Reporter" and "San Diego Magazine." He has written travel stories for "San Diego Magazine," the "San Diego Union" and the Copley News Service. Arnold attended San Diego State University.