When did you start them? The tet Sinfonia cross above was started on January 21 and showed germination on February 9, so is about five months along now.
This baggie is the only diploid seed I started this year, germinated on Feb. 29, about twenty days after the tet Sinfonia cross came up.
Almost all seeds germinated and they really seem to like the crowding at this stage; I don't know why but I have even heard some of the experts say that too. Containers that have few seeds germinate seem to move forward a lot slower, even in the baggies. But who knows... if few seeds germinate maybe it is just a lousy cross and even the survivors are doomed to languish.
Moving on... are you fertilizing?