Walking Iris, Neomarica or trimezia, are not hardy in your zone, don't plant it in the ground. I grow mine indoors in a brightly lit spot with no direct light and it flowers every spring. If you put it oustside it should go into a shady spot, mine have never done well in the sun, they kind of bleach out the leaves. Bright shade if that makes sense will give a nice deep green color to the leaves. Also go very light with any fertilizer, I fertilize once or twice after flowering and that's it.

I was also gifted with a walking iris and it did well in a bright room all winter,no direct sun. I just moved it outside and it did get bleached leaves that I just trimmed. Now it is in the shade with 2 buds I can't wait to see it bloom. Mine is in a small pot do they like to be pot bound or should I move it after it blooms?Thanks