I can't address your question about MP growing in cold climates because I live in the suburbs of Hades. (Louisiana gulf coast). I just wanted to say that I bought this cultivar - twice - and lost it both times. I so wanted to use it in my diploid breeding program, but since it seemed to be rather persnickety, I sure wasn't going to try a third time. I get the feeling that 'Malachite Prism' is just difficult to grow, but that may just be me.
