Much to my surprise, several C. graecum have now made it through 2 winters in my mound garden, which consists of nothing more than the clayey loam we excavated in order to put in a small brick patio and piled up next to said patio in a gentle mound. I had a lot of extra C. graecum at the time, so I planted them out with a liberal hand (and no thought to numbers, so I can't say what percentage persist). However, they have not only persisted, but some have bloomed (a little), and there are definitely more leaves there this year than last. I would have to assume that our superlative snow cover explains this uccess -above the snow, we go down to 0 to -10F, occasionally lower... Ellen Ellen Hornig Seneca Hill Perennials 3712 County Route 57 Oswego NY 13126 USA http://www.senecahillperennials.com/