Expert Gardener Ultra Southern Lawn Food Fertilizer & Weed Control 16 lb., kills the weeds, not the lawn. This granular lawn fertilizer and weed control product kills dandelions, chickweed and 110+ other major lawn weeds while feeding your lawn with a slow release fertilizer that feeds up to 3 months for a lush green weed free lawn. Apply when broadleaf weeds are actively growing in Spring or early Fall. Remember to always apply to a wet lawn and apply when no rain or water will be on the lawn for at least two days after application. After two days water in thoroughly, people and pets may enter the area when the lawn is fully dry after first watering. Ideal for use on lawn grasses Centipede, Bermuda and St. Augustine. Expect to see a greener lawn with weeds starting to wilt and die within 7 days after applying as directed.