I spray a lot of weeds with Roundup around our place but I don't like to spray around the pond. Here's how I control unwanted cattails. A couple times a year I mix up roundup in an old jar and use one of those disposable foam paintbrushes to paint it on the leaves. Just one swipe on 2 or 3 leaves of each plant always kills them. A lot less chemical and it avoids overspray going into the pond. Too time consuming for a large patch but an easy way to kill small patches that show up every year.
