Iris tridentata vs. nutrients

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I brought this up a few months ago but got almost no responses, so I
wanted to post a follow-up message.

I built a bog bed specifically for carnivorous plants this spring (about
3 months ago). My Sarracenia pitcher plants are happy as could be. I
also transplanted a couple Iris tridentata in there.

Now, 3 months later, the tridentata are thriving. I am gobsmacked how
much better the I. tridentata are doing in that nutrient poor bog bed,
than in the other (equally soggy) spot the others are in.

What's up with that?!

Would other irises respond like that? I. fulva? I. brevicaulis?

I've always thought of irises as heavy feeders, thriving on nutrients.
I can't stop scratching my head over this nutrient poor bed and my super
happy tridentatas.

Dennis in Cincinnati

(forgive the cross posting)