Matt from Valley Center writes
We do not recommend applying Roundup Pro Concentrate to a pond or around pond edges for cattail eradication. Diquat Water Weed and Landscape Herbicide is one of our top products for control of cattails as well as a multitude of other aquatic weeds. It is not harmful to any aquatic life and will control the weeds in the water as well as along the bank.
Answer last updated on: 08/29/2019