Sorry. Â Mis-ID. Â Is it a smartweed? Â Look at the stem where the leave attaches. Â Does it have a knobby bit? Â (Pardon my exacting botanical jargon....) Â That would indicate a polygonum relative. Â Are the plants completely separate? or are they connected by an underground root? Â
   They are not peppers, nor any other tomato relative.  (And it's not pigweed, what was I thinking?)Â
Some kinds of perennial smartweeds can be hard to eliminate, so I would make sure that you have a positive ID on this one.