Onion dropped onto the floor

So the other day I dropped 1/2 an onion onto the floor, which was dirty at the moment.  So instead of tossing it into the compost bucket, I decided to try planting it in my green house.  So far there are two sets of greens coming out of the onion.  I will try to remember to keep you updated on how it goes.  You can see some "young" onions planted near this one.  Those are ones I bought last year, that never did anything besides produce the greenery that you see right now.  So I decided to dig them up and plant them in the softer and richer soil in my raised bed/green house.

Edit:  See this onion bloom in late April.