When you start noticing that beautiful vibrant yellow bush in your grandma’s yard, you need to spray your yard (and probably hers too).  Underneath your warm season turf, the soil’s surface is warming up and crabgrass is germinating.  Now would be the best time to apply a pre-emergent and nip it in the bud. A pre-emergent herbicide, as its name suggests, prevents the germination of those undesirable weeds. These products can be applied as a liquid or a granular.  You can pick up a pre-emergent at most lawn and garden stores or contact your local lawncare crew to spray, if they haven’t already.