Reward herbicide is fast acting and broad spectrum on submersed weeds, especially effective on elodea, Eurasian watermilfoil, coontail and duckweed. Recommended highly for ponds and along lakeshore areas. It is absorbed by target plants in just minutes with no toxicity to fish or wildlife. No Swimming Restriction. Reward also rapidly kills undesirable aboveground weed growth in 24 to 36 hours. Avoid application to desirable plants. It is a contact/dessicant herbicide. It is essential to obtain complete coverage of the target weeds to get control. For best results, apply to actively growing, young weeds.