Roundup For Lawns4 is a tough weed killer for use on Southern grasses that kills weeds, not the lawn (when used as directed). This product kills 93 types of weeds, including dollarweed, dandelion, clover and yellow nutsedge (see inside booklet for weed list). It can be used on Southern grasses, including Bermudagrass, Bahiagrass, Centipede and St. Augustine (including Floratam). The ready-to-use refill can be poured right into our Roundup for Lawns4 Ready-To-Use (Southern) Extended Wand bottle - no mixing or measuring required. This product starts working immediately and is rainproof in 4-hours. Roundup For Lawns4 kills the root so weeds won't come back. The best time for broadleaf weed applications is when weeds are young, actively growing and soil moisture is adequate. Weeds typically twist, curl or yellow within a few days of application, while weed death can occur within 14 days to 28 days. Roundup For Lawns4 is a simple step for home lawn care. No weeds. No worry.