Linus, I bought the double trillium only 2 years ago and it bloomed the first year in pot. But it was a mature division, of course. I grow the clone 'Snow Bunting' too. It is in bloom by now (2 stems, each with one bloom). I tried to take a picture but it was a mess because of bad light and also dirt on the white petals (heavy rain can easily ruin the beauty of white bloom).
About Glaucidium, I lost my first plant too many years ago. It was a y very expensive seedling. It has been killed by hard late spring frosts.