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 the Author
Thomas K. Arnold is publisher and editorial director of "Home Media Magazine" and a regular contributor to "Variety." He is a former editorial writer for U-T San Diego. He also has written for "San Diego Magazine," "USA Today" and the Copley News Service. Arnold attended San Diego State University.