abnchris, Just did mine (around the edges) with Rodeo... If you get a little on the grass around your pond, you won't have to mow it. Plus I think it it safer not having to mow right on the edge of your pond. I have a few friends that got their mower stuck on the edge of their pond trying to get the weeds close to it (including me). One buddy rolled his riding mower into his pond. Wasn't to hard to pull out but really messy.

Good luck to you!