I grow the following IB's but they are not planted in a bed that may get extra moisture to get them to rebloom. They are listed as re's in the database. If you grow any of these let me know if they rebloom for you and if so let me know if they are a consistent rebloomers.
Abby Chant
Bahama Blues
Concertina
Gnu Rayz - rebloomed once during a really wet fall
Intermediary
Viper - new to me, thank you Leslie
I began moving my known rebloomers to the same location this summer where it would allow me to make sure they got a little more water and perhaps a feeding after the spring bloom. Since I have limited space I would like to know how they perform in the fall. Any information about your experience with them would be helpful. If they are difficult to get a rebloom I will leave them where they are planted and invest in a new iris that will be more apt to rebloom in my zone 7a.