Oh, I start pretty much everything in late winter in my GH. Don't do a lot of wintersowing, but I am going to try a few things this year. And the Snow Crystals generally bloom before I can set them out, so the GH smells lovely!
And I just found out this past year that there is a pale purple version of the Snow Crystals type (can't remember the exact name just now) and I tried just a few late in the season. Very nice!