Q: Thinking of buying one 50lb bag but due the high cost of shipping seemed high like twice the cost of the product. So, I was wondering what the shelf life of a 50lb bag would be since I may use one about every year or so. Would the 2nd 50lb bag last and be usable if stored for a year in a protected area? I'm not sure how much of the fertilizer I'll use per year so trying to keeps costs down by buying bulk.