what Louisianna Irises would you recommend to grow in a bog bare-root/uncontained that they would not be as invasive as Yellowflag or atleast the least invasive varieties - i love them but i dont want them to choke up the garden pond area

Basically, any but the yellow flag iris are pretty slow growing. I've only had half a dozen varieties of water iris. The yellow flag grows like mad, the blue flag grows pretty well, and the others (which were some purple, a Colorific, and a few others that didn't survive) were relatively slow growing.

didnt survive cause of depth or because of winter?

How about bad luck? They just died, most during growing season. We're not talking about a lot of iris. Let's see. I had a red one that lived about 4 years, and then simply stopped growing. I just got a black gamecock which is still alive. I had a white iris once that died after just a few months (during growing season). That's about it.