Thanks for the kind replies.
I don't find it any easier, when I had a big area I alternated between pulling the whole thing and replanting tops or just cutting off the tops. This bunch of Rotala has been propagated from a small number of stems that survived. I also have a few Vals back there but they haven't gotten any taller or spread enough to be noticed yet.
Very nice! I like your idea of more rotala along the back, the clump looks too narrow for the height now. But I have too big of an area of it, wish I was better at controlling it, I'm sure you are, lol.
I don't find it any easier, when I had a big area I alternated between pulling the whole thing and replanting tops or just cutting off the tops. This bunch of Rotala has been propagated from a small number of stems that survived. I also have a few Vals back there but they haven't gotten any taller or spread enough to be noticed yet.