I have a colleague who is a forester in NW Russia. He visited the Pacific Northwest in May and was taken with the tall trees. He lives in a land of birches and Scots pine. He would like to find trees to plant around his summer house near the White Sea that years from now might grow as large as the trees he saw in western Oregon. The problem, of course, is the winter cold. He tells me that an average winter could see a temperature of -20 C at his cottage. A bad winter could see -37 C. So, any suggestions on what large North American conifers would tolerate that cold? Also, he will probaby need to import the seed rather than a growing plant, so any suggestions about seed sources would be welcome.