I know this is probably a shot in the dark, but my parents gave my husband and I some flowers boxes and one was already filled with dirt. We planted flowers in it and all of a sudden, mysterious plants started popping up. I called my parents and asked if they put seeds in the box and they said yes, but they couldn't remember what they were. So, can anyone identify what kind of a plant this could be? There are at least 3 that I can see in there now amidst all of our flowers.