The selective, systemic formula kills over 200 types of broadleaf weeds, roots and all, without harming your lawn grass. Wisible 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. About Bonide: Bonide has been trusted since 1926 as the leader in providing the excellent possible products and solutions for home, lawn and garden pest problems. Based out of Oriskany, new York, we continue to grow our reputation as a leader in the lawn and garden care categories by delivering the highest quality products alongside our great customer service. Our goal is to help consumers throughout their entire purchasing process by recognizing signs of trouble, developing the excellent solutions and recommending the ideal products.