Looks like a weed to me but I don't know its name!

There are several forms of oenothera, which I think this is; not all are weedy or invasive--they are beautiful bloomers which do attract many betterflies. If you deadhaed them then there's no reseeding.

Thanks again trudi! Now I remember! I had planted it two years ago and it did well the first year, but not so well last year. It seems very happy this year. So I won't pull it out. Maybe I will even figure out how to get it's oil and use it.(half joking)

Audrey

It is Onothera biennis. I have some in my garden and they reseed readily. They grow wild across many of the northern states. They have a pretty lemon yellow flower.