Why are there three numbers prominently displayed on every bag of fertilizer? Allyn Hane, “The Lawn Care Nut,” draws on his 15+ years of professional lawn care experience to answer that question and others. “You know those three numbers that you see on every single bag of fertilizer that’s on the shelf these days? Well, today, in our Toro Yard Hack, we’re going to talk about those three numbers, what…