I have a bag of granule lawn fertilizer (not weed and feed) that I am looking to store after having applied part of it to my lawn. What is the best way to store fertilizers, and how long can I store it before it goes bad?
Some fertilizers are hygroscopic, perhaps even deliquescent. In other words, they suck moisture out of the air and get soggy. Not all fertilizers do this, but you won't know until it happens, or not. To prevent the possibility, you'll want to store in airtight containers. 20L paint buckets with lids work well.