when a non-professional asks a question? 51 views to my question below and no responses? It is a simple question; is 10+ year old 18-24-12 fertilizer any good? Would it hurt to put it out on existing grass fields? I am not trained by any means, but I am titled as Grounds Manager at a private college in Kansas City. Mostly I cut the grass (45 acres)and keep things looking nice, but I came across this fertilizer in a back room here in the shop and wonder if it is any good. A response would be appreciated. Give me a yes/no and I will never invade this holy space again.