I've tried some from corms, but they came to nothing. They were shipped in compost, but I didn't plant them immediately (my fault, I know). I was wondering if it was worth trying to grow them from seed as I'd stand a better change of planting-out keeping them moist. I was looking at Plant World Seeds site: http://www.plant-world-seeds.com/store/view_flowers?page=22
The only success I have had with Trillium seed was from very fresh stuff from my own plants. Not sure, but I have a feeling it is one of those short lived seed types.