Without perlite or vermiculite to lighten the medium and provide air pockets, the medium can get muddy and suffocate the roots. This condition will lock-out any moisture or nutrient uptake. The soil might be holding the moisture too well.

What kind of medium (soil) are you using? It looks rich, but incomplete.
Rusty Trichome Reviewed by Rusty Trichome on . The experiment...going wrong? Right so new enough to the whole thing, i.e. site included so dunno if this is posted in the right spot or whatever but have a few bag seeds and did the whole germination in the paper towels and two popped the shell and I in turn popped them in some compost soil for seedlings and covered it with clingfilm...:) so I was thinking happy days ...however the first seed which is now about 5 days post germ has sprouted which (I am pleased to inform peeps about) but the tip is brown and since day one Rating: 5