Fiesta is an organic based bio-herbicide. Bio-herbicides are derived from natural sources. Fiesta is a mineral based bio-herbicide created to control a wide variety of common, broadleaf turf weeds, when applied in accordance with the labeled instructions. In most cases the initial application will control the weeds that have emerged, but some larger, tougher weeds may need a second application. Fiesta, as part of a 5 application program, will help control your weeds without chemicals!