I was wondering if I need to separate the lilies. I have a few that are growing over the sides of the swallow pots I have. I do not mind if they spread like that at all and almost seems what would happen in nature. Just did not now if that is good or bad for the lily. They seemed to do good last year and flowered well. I prefer they just do there thing and then just thin them when needed. The fish do not to seem to eat the out growth at all.