The power is in your hands to keep your landscape in line – unleash it with Spectracide lawn and garden products. Our easy-to-use insect, lawn disease and weed control solutions help you tame lawn and landscape invaders with incredible pest-punishing power. Apply Spectracide Weed Stop For St. Augustine & Centipede Lawns, 32 Ounces anytime temperatures are below 90 degrees on St. Augustine grass and centipede lawns. When used as directed, this product kills the weeds, not the lawn. This easy-to-use product is designed with the Quick flip sprayer, allowing you to just connect your hose and spray at the flip of a switch. This product is for outdoor use around the home.