It's quite a coincidence that this came up; I was just going to post a question as to whether broccoli leaves were edible or not. As usual, I planted my broccoli in spring so that they would mature in the blazing 90 degree plus heat of summer! Never seem to learn!
Anyway, the result is a huge plant of broccoli leaves, and a tiny little hint of a head, which I can see is going to bloom in a couple of days. I was thinking I could maybe harvest some of the newer leaves and it wouldn't be a total loss! Guess I can cook them like cabbage if I want?
BTW, I'm voting for broccoli on the unknown plant, guess time will tell!?