Tom - I think that may be due to the vendor as much as the iris. I got some very large dwarf rhizomes last year too, but then I got some extremely small ones as well. So I am thinking it is more a result of how & where they were grown.
What surprised me with SF iris is how few are named for the ladies. Why is there not a Hermione to go with the Dumbledore, Muggles & Golden Snitch? Or a Arwen Evenstar to go with Eye of Sauron, Mordor, et al? I think there may be a Princess Leia out there but I would need to check the AIS wiki.
