I'm curious as to which type of arilbreds you have tried. With your collection of MDBs & SDBs, I'd have expected arilbredmedians to do quite well there.
In a message dated 4/19/2010 7:57:52 AM Mountain Daylight Time, firstname.lastname@example.org writes:
Median iris, especially SDB's, are the main part of my collection. MDB's do well here too.
Historic TB's seem to do better for me than more modern TB's, although I do try to order a few new ones each year. Last year, a friend gave me 2 historic Japanese iris. They're greening up already, so I'm quite pleased.
I've managed to keep a few AB's alive long enough for them to bloom, then most have died, alas.