Well I will tell you it isn't easy work getting rid of them. I moved into my house and I had about three nice size patches, then with in two years they almost surrounded my pond. I did a combination of things Round up and the next year I took a weed razor to them. If you keep up on them you will be amazed how much difference you can make in one year. The weed razor is great but if you have fully grown cattails it can be some work. I was sore for several days after. LOL
