Hi, I had an impostor that appeared in my Blueberry plant pot, it was growing rapidly. So, I transferred it in to a pot to see what it might grow into. It grew at a pretty fast rate, I would say up to 4 inches a day. It now stands at around 6ft 2" tall. I was thinking maybe it is a Sunflower but, if it is, it isn't like any Sunflower I have grown before.