What is the best way to store an opened bag of lawn fertilizer?

Question: 

What is the best way to store an opened bag of lawn fertilizer?

Answer: 

Store lawn and garden fertilizers in their original bags or containers so you will know the content and analysis of the product next season.  Store granular fertilizers in a protected location where they will remain dry.  Granular products absorb moisture from the air, causing them to cake up like cement.  An excellent way to store opened bags of lawn or garden fertilizers is to place the bags in large containers, such as 5 gallon buckets, and cover with tight-sealing lids.  

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