I think it is a weed in the mustard family. I'm not sure which one off the top of my head. Some are edible but best to get a definitive ID if possible, just to be safe.
Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
It does look like some kind of mustard plant. I wouldn't advise eating it just yet...
Maybe you could let them mature, keep a photo journal, then collect and photograph the seeds. That should help get a pretty good ID.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"
