I couldn’t find any reference to this anywhere so maybe someone has seen it. Either that or I’ve hit the Bad Luck lottery, again.
I’ve sprouted a lot of seeds for my self and fellow growers and always sprout them in rock wool cubes right in the hydro. For three of the last four I;ve sprouted I’vecontered the exact sme thing. The sprouts pop right out and stand tall but then the crown never developes. So I wind up with a very nicely formed stem and a little bitty pair of leaves for about 2 days before they just croak and fall over.
You can see in the pics the progression of whatever is happening. I had one friend who mentioned scoring the seed case before sprouting but it appears to as if the seed case splits just fine and falls away. I’ve used the same process for 25 - 30 sprouts of both seed bank and local seeds. (All the ones that have flaked out have been seed bank seeds from different sources and 2 dfferent people so mishandling, mishap and contamination are pretty much ruled out.)