Too cold?
Too dry?
Too wet?
Too light?

That's all I can think of now...

Could be a bunch of dormant seeds. Try roughing up/scratching the outer shell a little bit. Or try peat pucks (?) I think that's what they are. Small discs of peat with netting on them. I recommend taking the net off. Had them under a dome, which I kept humid and dark, and it worked 100%.

Good luck :jointsmile: