Wow, Tim! That's amazing growth!
I had some pretty fast growers.
One noid which looks like Indian Chief was planted in August and one rhizome inparticular sent me up seven increases, while most of the others did 2-4 increases.
Cat's Eye was a decently small rhizome and planted in September 2018 and it shot up five or six increases.
Currently, there's a lot of three-four increase rhizomes, but some of them have produced increases really fast. Kwik Kash has three, Epicenter has three, the old iris Florentina has sent me three (after two full months of waiting for any indication of increase). The other noid that a friend gave me with the Indian Chief lookalike, most of the rhizomes have 2-5 increases.
There's quite a few that were more recently planted (October) who haven't given me any increases, such as Thornbird which I am shocked by, but Tobacco Chew is growing rapidly. I figure the later planted ones didn't have really a large amount of time to send up increases - some of them probably have gone dormant.
One iris inparticular comes to mind that is really lacking.....Golden Panther. It was planted in August, with two fans (two rhizomes conjoined at the middle to make a super..rhizome?) and a huge rhizome, and it has not even sent up one. I very gently brush around the sides and backs of the rhizomes, and nothing. I'll have to see what happens with Golden Panther though. It could be simply where it is planted.