Iris vartanii
Peter Taggart (Sat, 02 Feb 2013 10:04:27 PST)

I lost most of my stock of I vartanii at around minus 15 c, the rest died
at minus 18 the following winter. The biggest problem growing it is, (in
common with some other reticulate Iris in the UK), it does not like
temperature/ moisture fluctuations while in full growth. In my experience
it doesn't care for freezing temperatures either -even though it may
survive. The worst thing for a reticulate Iris is when it gets warm and wet
as the leaves start to wither and the roots are dieing off for the summer.
I expect it would perform better in a continental climate!
Peter (UK)

On Thu, Jan 31, 2013 at 5:56 PM, Sean Zera <zera@umich.edu> wrote: