Andersons 0.48% Barricade Pre-Emergent Weed Control Herbicide for Lawns and Landscape Ornamentals on DG Pro prevents unwanted annual grassy and broadleaf weeds, including crabgrass, poa annua, goosegrass, and henbit. Prodiamine, the active ingredient in this pre-emergent herbicide, is proven to eliminate undesirable weeds without harming beneficial plants.