When I asked my state DNR and county extension what to use on cattails they suggested roundup. When I asked them about what I've heard regarding it's effect on amphibians they said that is an over reaction. I've been using it around both of my ponds. One pond is just a duck pond and has zillions of frogs, still has zillions of frogs. Does all roundup contain surfactant? I think the stuff I buy does not since my labels tell me to add surfactant. So I use dish soap or car wash soap for a surfactant and it appears to work fine, it's cheaper too.
