Barricade Turf Herbicide (Syngenta)For pre emergent control of weeds in established turf, garden beds and nursery pots. BARRICADE is a selective pre emergent herbicide that provides residual control of weeds in established turf, garden beds and potted plants. BARRICADE controls susceptible weeds by interfering with cell division in the root tips of newly germinated weeds. BARRICADE Herbicide controls a wide range of pre emergent grassy weeds. You can trust BARRICADE to last for up to 6