Hi Leena,
My understanding is that you have requested seed of Dodecatheon frigidum and D. pauciflorum from the seed exchange?
I have never grown Dodecatheon frigidum. From what I have read about the species it appears that it would be cold hardy and tolerant of summertime moisture. Perhaps this species would be a very good candidate for your garden. It seems well worth the effort to give it a try. I will be extremely curious with your results with this species.
Yes, I put D.frigidum in the main order and D.pauciflorum in the extra numbers, so I'm not sure if I get that, but we'll see.
I will report how they do here if I get seeds. Most likely I will keep them in the cellar for the first winter, just to be sure they are big enough to survive when they get planted to the ground.
I do this with most new plants, just in case.
Thank you again for your experiences with these plants!