stone,
Evening Primrose appears to be similar, but what I have read says it is a low growing ground hugging plant, my plant appears to be getting tall. Guess I will wait till it flowers then see if I just need to pull it.
I think this should be a another "final" lesson for me not to plant mixed flower seed packets. I seem to get more weeds out of them than flowers. This is the final "final" lesson maybe, it seems I say this every year.