To be honest, big ditchlily patches are actually easy to clean up once fall hits. You can just leave it there and let it compost, but it does so rather slowly as the foliage is pretty tough. Personally, I prefer to clean it all up, but a lot of that is due to me wanting to be able to see any new shoots coming up as early as possible without having to look under/move around. I have to pull these shoots and the rhizomes associated with them to control area I wish to keep them in.
