Brussels Sprouts Sprouting

There's always something new to learn in a garden. A couple of Brussels sprouts that were buried in my garden soil along with my other vegetable scraps found their way near the surface of the soil — and took root and sprouted. I've had other veggie scraps do this (onions, garlic, tomatoes, etc.) but these are the first Brussels sprouts to do so. They appear to be growing into full-on Brussels sprouts plants. Only time will tell if they mature and bear sprouts of their own. I wonder if individual sprouts can be broken off the main trunk (I have bought the intact trunks filled with sprouts at EarthFare rather than buying loose sprouts) and rooted in transplant medium, getting a head start on creating seedlings for planting?

I'll update this post with progress shots to see what happens. But for now, they are looking like real-live Brussels sprouts plants: