Name: Catmint/Robin PNW WA half hour south of Olym (Zone 8a)
Thanks so much, Stefan, I think you hit the nail on the head!! I l googled around and Polygonum persicaria is apparently a common weed here in Maryland, so that's probably what it is.
"One of the pleasures of being a gardener comes from the enjoyment you get looking at other people's yards”
― Thalassa Cruso