Asters or Weeds?

Asters or weeds?
Can you identify the growing plants, which have seeded outside the pipe or barrier?
I thought they were weeds, and left them to act as a barrier against ants moving near the house foundation, and entering, until the peonies finish blooming.
However, after reading your response to a question about “astrids, mums and early identification”, I wonder if they are the asters which have moved by reseeding? They are the tall green plants, and I’ve included one pic of the top, which look like an aster in an early stage.
I looked briefly at a couple of identification websites, but those usually help with the bloomed flower.
I guess I can always wait and see, replanting them where they might be better suited. Edging is something that seems at the end of the gardening list of things to do. What part of the season is that best done, since I would imagine it would be best done at the end of the season in the vicinity of the plants, so nothing is disturbed.