Symphyotrichum subulatum (Eastern Annual Saltmarsh Aster)
This is a two-fer. The original plant in the pot is Gray Goldenrod (Solidago nemoralis), but a native aster seeded itself in the pot and is flowering. Most likely Symphyotrichum subulatum (Eastern Annual Saltmarsh Aster), but completely sure on the ID.
***As with any plants in Odds and Ends section, we do our best to identify the plants correctly, but we do not guarantee the identification and all sales are on 'as is' basis.***