Welcome Joanna!
That is a Siberian iris and I have no experience in growing those. I grow bearded irises and what you have there is a beardless iris. Since it's a Siberian, it has different growing conditions than bearded irises and other beardless irises. I know all I've done is confuse you more, so I'll let others with knowledge in growing these step in.
I do love the dark irises, so I hope it does well for you.
edited to add:
Arlyn
