Bonnie - I know what you mean about them being called weeds. The native species Yellow Flag grows everywhere there is a pond, but they have been labeled a nuisance plant now. I got some species cross on order, and the first thing the grower told me was "they are sterile, so you won't have to worry about their seedlings taking over the waterways." Sad really. And there are a lot of native LA iris that have been lost forever because of taming.
My ensata species is a slow grower, but I would hate to relegate it to a pot. I have some other JA iris on order to flank my species.