Here's the first raised bed with growing Nemagone mustard.
So far, so good. I don't know if they will grow through a hard freeze. Time will tell. They are reported to die with a 26°F freeze. If they don't survive, I'll just cover with leaves for weed prevention.
I'm growing the Nemagone as a sort of biofumigant. Also here. It's meant to reduce potential pest and disease load in the soil, as well as being a ground cover to reduce weed seed load, and a green manure crop to return nutrients and humus to the soil. That's a lot to hope for. It also may not be necessary, since I don't bring in plants or soil from elsewhere (except tree leaves) and I rotate my crops. But I don't think it hurts, and it might help.
I had these through the winter, two years ago. They survived, and then grew very well in late winter / early Spring.