Bonide Weed Beater® Lawn Weed Killer ConcentrateThe selective, systemic formula kills over 200 types of broadleaf weeds, roots and all, without harming your lawn grass. Visible results in just 24 hours. Containing Trimec, this product is especially effective on all hard to kill weeds such as poison ivy, poison oak, sheep sorrel, and spurge. Won't harm lawn grass when used as directed. Product performs well in both warm and cool weather. Controls hundreds of listed Broadleaf weeds Won't harm lawn