I'm not going to go into the exact details for these just yet... if warranted I'll get around to that in due time. But I'm excited and hopeful that something REALLY COOL might be happening here! By all conventional thinking, these seven seedlings should just be simple crosses of two Miniature Tall Bearded (MTB) irises. But they're from an unconventional "anomalous inheritance" experiment, which might just be the reason why three of them are so unusually vigorous. The one in the lower left (circled in yellow) is especially so - it's showing 18(!!!) increase fans of various sizes. Compare this to the four normal-looking siblings with 2 or 3 increase fans visible.
The second picture shows that most extra-vigorous seedling closer-up. It's supposed to just be 'Bach Fugue' X 'Astra Girl', that is unless... [stay tuned next Spring (maiden bloom) for the conclusion to this story]