Asked June 21, 2021, 5:03 PM EDT
Clackamas County Oregon
Thank you for your question. Are you able to pull one up and take a photo of the entire plant, including roots? We need to see how the leaves are attached to the stems. Have any plants developed flowers? Those would be helpful, too. Thank you!
Thank you for the photos! All agree it is willowherb. It is either native or naturalized: https://horticulture.oregonstate.edu/weed/northern-willowherb
Abby: the difference in nomenclature is that a 'weed' is just a plant in a location humans don't want it. It really doesn't have a scientific meaning. Invasive plants are non-native species which are introduced from other regions, that compete with species often established centuries ago. If you don't want it, pull it!