Persicaria virginiana?

Look at Persicaria lapathifolia, pale persicaria

Yes Persicaria virginiana.

Thanks, everybody!! Can't figure out how it winded up in my flower pots. I have a thurd floor balcony. I assumed it was something I planted (but didn't) because, in one pot, the sprouts were perfectly spaced out, just as I would have done. Well now that I know, I will rip them out. The flowers are too small and "blah" and my balcony realestate too precious to waste.

Coriander, Vietnamese – Persicaria odorata

Persicaria pensylvanica!

Identification rests on many physical features of a plant but also on what is feasible or likely in a particular area. Vietnamese coriander, a tropical species, is not a candidate plant to be self-sowing in the Great Lakes region, however similar it looks to the picture.