Drive by any neighborhood after winter and you will most likely see little flags or signs on many of the lawns. We all know that means those properties have been treated by a lawn fertilization service. So the sign are just there as an advertisement for those companies, right? Nope. So what else do those signs indicate? What is an REI (hint: it's not just a great store)? How do you find out how long you should stay off your lawn once those signs go up? Find out in this episode of EcoLawn Science.