Lawn fertilizers help keep grass vigorous and healthy, making it more resistant to weeds and infection and improving ability to recover from environmental stresses like drought and wear. Regardless of fertilizer brand, all products primarily contain the three essential nutrients -- nitrogen, phosphorus and potassium -- and may be stored for specific periods of time without losing potency.
Shelf Life of Dry Fertilizer
"Shelf life" refers to the period for which you can store lawn fertilizers. Dry lawn fertilizers that do not contain any pesticides may be stored indefinitely, according to fertilizer manufacturer, the Scotts Miracle-Gro Company.
Shelf Life of Liquid Fertilizer
Liquid fertilizers are often preferred by homeowners for their easy spray application, via garden hose. These fertilizers easily cover an average sized lawn in about 10 minutes. According to the Outside Pride company site, the shelf life of a liquid lawn fertilizer is between eight and 10 years.
Lawn fertilizers that include the world "propagules" on their label have a short shelf life and cannot be stored for long periods like liquid or dry fertilizers, according to "The Homeowner’s Complete Tree & Shrub Handbook."