What is up with the broccoli? Seriously.

You can't really get a feel for how large this is from the picture, but the width of the garden bed is 4 feet. It's enormous and still shows no signs of what we think of as broccoli. It should form in the center but so far just keeps producing big, showy leaves. I'm going to give it another couple weeks, then it'll become chicken food. It's creating a bit too much shade for neighboring plants and seems like a lot of fanfare for the whole lot of nothing it's produced so far.

Suggestions? Insight?