Mystery plant revealed

So the mystery plant in the garden reached immense size last week.



Right before I left for the weekend, I noticed that it had little broccoli-like florets on it. Ah-hah! I thought. I've grown a mutant broccoli plant.



When I came back it had bolted and the florets had bloomed.



I stared at it for a while and decided it had to go. It was shading out everything else in the garden, and I don't think broccoli leaves are good to eat, and it obviously hadn't formed proper heads. Maybe my homemade compost had mutating powers?

But when I pulled it I discovered it was a Turnip of Unusual Size.



Almost three pounds of turnip!



I have no idea if a bolted extremely large turnip is good to eat. I suppose I'll give it a shot - if it's awful, the chickens will probably nom it down.