Thanks. That's what I thought. I had a discussion with someone regarding the cold requirements of a non-iris, Vernonia larseniae, since stratification was recommended, but the vernonia grows in a habitat where sub-freezing temperatures are not that common, so that a requirement for cold would seem a poor strategy for survival.
I grew a hybrid of I. haynei, Galeet, I think, for many years in the garden here, so I also wonder about inherited cold hardiness in the lower-elevation species. That is, which way the oncocyclus species dispersed; south to north, or vice versa.
The insistence on maintaining green leaves during cold winters (e.g. Iris iberica, paradoxa, sprengeri, etc.) seems very strange to me, too.
