XiaoLong said:It looks like a kind of Amaranthus to me
greene said:Princess, a little more information please. It appears to my eyes that you may have started this plant from seeds...is that correct? If so, do you remember what else you were planting at the time? If not, did you dig these up from outside and place them into the container?
I'm guessing it could be Red Root Pigweed aka Amaranthus retroflexus but that's only a guess.
Is that a weed?