Hi Erlend, I HAD a seedling of it but it died this winter
it is sayed that it is as cold hardy as a Tr.Fortunei but that it grows a little bit slower, I think that if you protect them to the rain in the winterhmontsh that they can survive easily there, here in holland I also know people wich are growing Wagnerianus and in Norway there will also be people wich grows this beautiful palm.
succes with the seeds and you know that the seeds don't like heat/warmth??
(20-23 degrees is enough)