Great for preventing weeds in landscape beds!  Hi-Yield Turf & Ornamental Weed and Grass Stopper provides superior prevention of crabgrass, as well as suppression of other listed weeds when applied before they germinate.  Hi-Yield Turf and Ornamental Weed and Grass Stopper contains Dimension, a selective pre-emergent herbicide with the active ingredient dithiopyr. In addition to preventing the listed weeds from growing in your lawn, it also provides post-emergent control of crabgrass only up to 4 to weeks after it has germinated and emerged. Do not apply this any later than 4 weeks after crabgrass has germinated. Hi-Yield Turf & Ornamental Weed and Grass Stopper can be applied to both warm and cool season grasses.