This simple to use, Navigate granular aquatic herbicide is perfect for spot treating weeds around docks, beach areas and shorelines. Navigate herbicide kills the roots of many plants such as Water Milfoil, Coontail and Water Lilies. This aquatic weed control works on both submerged and floating aquatic weeds. Visible effects of dying weeds may take up to 10 days, full effects will occur in 3 to 5 weeks. Navigate treatment may be performed all season although early treatments may require less product. Late season applications may not be fully realized until the following season.