BioAdvanced Season Long Weed Killer is a pre- and post-emergent formula designed to handle existing and potential weeds in your lawn. Our powerful pre- and post-emergent formula eliminates a wide range of listed weeds while also preventing new growth for up to 4 months. When used as directed, it won’t harm most northern and southern turfs. It is ideal for clearing away common listed weeds, even nutsedge. For a healthier, more weedless lawn, choose BioAdvanced®. Get More From the Blue Bottle®.