I planted this from a seed packet, obviously scattered the seeds liberally (which would have been per the packet instructions), but I threw the packet away and have NO idea what it is now. Since this photo was taken a few weeks ago, the plants have gotten three times as tall, at least. There's nothing to the root, really. The leaves are a bit prickly and tasteless. I want to know i I should thin the seedlings, but I have no idea what it could be. Thoughts?? Thank you!