Monterey Weed Impede (Surflan Herbicide) Monterey Lawn & Garden Pre Emergent Herbicides-Qt Oryzalin - 40.40% Weed Impede is a pre-emergent treatment for control of annual grasses and certain broadleaf weeds For use in Certain established landscape ornamental plants, including trees, shrubs, ground covers/perennials, and flowers, non-bearing fruit and nut trees, non-bearing vineyards, and ornamental bulbs grown in flowerbeds, ornamental plantings and rock gardens Controlled: Carpet weed, Purslane, Chickweed, Groundsel, Henbit, Prostrate Spurge, Pigweed Qt