Posted: 29/03/2013 at 15:01
Hi Marina, I've not grown them myself, but the info regarding propagation from seed on the RHS site looks as though it will be very useful. Seems plenty of patience needed with these:
"Trillium seed has double dormancy. Sown immediately after harvest, the seed will germinate the following spring, after a period of chilling, to produce a root. Another cycle of warmth and chilling is then necessary for a shoot to emerge the second year. After a further two or three years the characteristic three leaves form. Flowering may occur a year or two later."