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Of the plants that you've listed, we've had the most trouble with Iris pseudoacorus. We grow it in pots slightly submerged in the water, but as detritus builds up near the rim, it seems to want to climb out. Every so often (once a year or every other year) we thin them out. Take note that weeds will also grow in these pots, so that can be a chore. Juncus does spread, but not to the point of being a problem. We don't bother using pots with these as they don't run with rhizomes like Iris does. Most of the Juncus seedlings that have appeared have been welcome and when not, are easy to pull. I don't have enough experience with Cyperus to really comment thoroughly. We do have some in a large pot within a fountain. After 3 years, the clump is showing little sign of wanting to migrate. Maybe others can give you better feedback on this one.
As for other plants to consider.....whew, I'll have to narrow down my list of favorites. By the way, all of these will thrive in your area, but will NOT be invasive like some others might be.
Itea virginica- virginia willow
Hymenocallis caroliniana- Spider lily
Osmunda cinnamonea- Cinnamon fern
Osmunda regalis- Royal fern
Lobelia cardinalis- Cardinal flower
Acorus sp. - Sweet Flag (maybe the one exception to not spreading. The clumps will grow quite large, but can easily be divided. And that foliage, ah, it smells so good!)
Saururus cernuus- Lizard's Tail (okay, this one spreads too, but it's really cool. Much more of a threat than Acorus)
Cephalanthus occidentalis- buttonbush
Clethra alnifolia- Sweetshrub
I could keep on going, but I'll stop here. If you want more info on any of these, let me know. I'd be glad to help. I love these wetland plants.
Whatever you do, stay away from Elephant Ears!!!
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