Hi There Mark & Wendy,
AUTUMN CIRCUS, is both new and old to me at the same time!
I had this iris in one of my very first orders. It lasted two years, but never re-bloomed for me. (Because of my cold climate, combined with the fact that I don't pamper the re-bloomers like I should, nothing really reblooms for me.)
Since your clump was only 4 months old, you probably have a "fall spike" that decided to come up. Of the other 3 fans growing, some of them should bloom this fall (I mean, your spring, there in Australia.) :-)
Glad you have some color!
Thanks for sharing! I'm going to go take some photos of what I have in bloom now. :-)