About Hi-Yield 33030 Turf & Ornamental Weed & Grass Stopper: Provides superior control of Crabgrass and many other annual grass and broadleaf weeds. Use in ornamental landscape areas, established lawns and ornamental turf. Can be applied up to 4 weeks later than other preemergence Crabgrass preventers.About Hi-Yield: Made by VPG Inc., in Bonham, Texas, USA, we have existed to strengthen, empower and support locally owned merchants.