Originally Posted by Kiril
See now I have to agree with Ric (kill me now). If you need to control weeds, then do it when they appear. "Just in case" applications of anything is an asinine practice IMO.
Let me say I believe in a once a year Spring blanket spray on thinner lawns with a low rate broad leaf herbicide. This is to catch those broad leaf weeds before they get started. On my thick lawns I use post emerge only as needed. Depending on the lawn it might take two years to get it thick enough not to blanket spray in Spring.