You’ve just finished your spring/summer garden and all of the plants are thriving! You’re excited to spend time outside in the sun, but you realize that it’s been a while since you last fertilized the soil. How long does fertilizer last?
The answer is: it depends on what type of fertilizer you use. Soil isn’t like a cookie jar where the soil in the bottom gets pushed to the top when something new is added.
The particles are continually mixed together, which means that fertilizers can last longer than we think! There are three types of fertilizers with different active ingredients and each one lasts differently.
Inorganic Fertilizer – this may include chemical or natural elements such as ammonium sulfate, potassium chloride, calcium nitrate, and phosphoric acid (such as a bone meal).
Inorganic fertilizers will not break down over time and have an indefinite shelf life once they’re open because there’s no organic material present for bacteria to feed on.