This is just my experience in my conditions and others may have different ways of germinating these with equal results. I only have experience with natural stratification. You can stratify these artificially and others on here are much better equipped than I on how to do that.
I fill a pot to about 1/2-1 inch below the top with 50/50 peat/sand or peat/perlite and put a thin layer of cut-up dead LFS on top and spread the seeds over that. The LFS helps keep the seed from washing out during winter rains. I keep the pots in a tray of water no more than half way up the pot. The seed need a cold wet stratification period, so I sow the seed in the fall and leave outside to stratify naturally. I get excellent germination rate. After germination, I leave them in that pot where they get about 4 hours of morning sun and bright light the rest of the day until the following spring, and then separate them out and put into separate pots with live moss top dressing, the bog, or my pond "fen," where they then get 6+ hours of full sun.
This year I set up some pots with pea gravel top dressed with live moss with the water level at the top of the gravel, and they seem to be liking that with a water change every couple of days and top watering once a day. I have to cut the moss back often though or they take over the young plants.
They do best if you can set up some kind of system with a constant flow of water through their roots, but they do okay by just top watering a couple times a day with cool water. The important thing is not letting the roots overheat and giving them the cool oxygenated water they need. A top dressing of live moss works wonders in preventing overheating and also having them in a large pot; terra cotta is a good choice to help keep the roots from overheating while still providing the sun they need.