Mine sprouted weeks ago, but they're not doing anything, just sitting around looking stupid. This was yesterday.
I thinned them to one seedling/cup yesterday and added some soil to the top of the cup.
But look at the roots. Rotten photographer, but you can see that while the seedling is barely 2" tall, the roots extend to the bottom of the 16 oz. cup, through 3" of soil.
Karen