Iris tectorum
Jane McGary (Mon, 19 May 2003 11:18:00 PDT)

My understanding of the term "roof iris" is that this iris was sometimes
allowed to grow on thatched roofs to help hold hte thatch, but it seems
more likely that it would break it down. Plants on sod roofs, however, are
useful and beautiful, as often seen in Alaska.

Regarding the hardiness of I. tectorum, it seems quite cold-tolerant and is
grown in many parts of the USA, including northern states. It does well
here until the slugs get hold of it--none of the crested irises can survive
them, even I. tenuis, which is native not ten miles away (and higher up in
the mountains, above the slugs).

Jane McGary
Northwestern Oregon, USA