I recently germed some seeds. I just planted them in a Burpee mini greenhouse, right into the little coco pellets. Six of eight were really vigorous right out of the gate, emerging in only a couple of days. Two others were no shows, or so I thought. While one of these was likely a dud, I found a fat root protruding from the bottom of the other when I finally gave up and decided to pull the inactive seeds. I gently removed damp coco from the pellet and found that the edge of the cracked seed had nearly severed the stem, just below the cotyledons. I think it was just a bit of bad luck but I will be more mindful of planting depth next time.