Natalie,
My reference to "Sterling" is because that cultivar was hybridized by Sterling Innerst. Sterling Innerst hybridized over 200 irises in his lifetime and was local to my current South/Central PA digs. I am trying to collect all of his introductions. A TALL task. So I overly gush about his plants.
Greg
Both "Again & Again" & "Over & Over" are his work. They both are just ok to look at, but reproduce/increase at a crazy rate.