Maybe I'm just not observant but this large bush (~3' rough globe) seems to have sprung up in no time out of nowhere. Some plant ID apps have tentatively ID'd it as American Black Nightshade but I'm not sure. Thoughts?
This seems to have exploded from nowhere.
It does look like a nightshade (Solanum sp.) There are several similar species, all equally weedy.
Nightshades proliferate wildly. Unless you like it a LOT, pull it out now.
Thanks, and done. It was in a strange place: in a bed I'd planted and in a spot where I might well have intentionally planted something. I let it grow because I couldn't figure out if I'd put it there on purpose or not. Then, almost overnight, it was huge.