Number 4 looks like the asters I have here, spreads fast but easy to pull the young ones.

The last one looks a lot like the bellflower (campanula) that I have, which I think may be the European Bellflower. The flowers are pretty, but it is considered an invasive species. It is a stubborn plant, hard to get rid of and spreads by seed.

Numbers 1/2 look awfully familiar, I've had it growing, but can't remember if it was a weed or an intentional plant.

If that is a plant you do not want growing where you do not want it to grow it is a "weed". All those things we tend to call "weeds" are plants and some have value if growing where they belong.

The first pic resembles Delphinium. The second possibly an Oenothera species or maybe not, but I'm throwing it out there. If there is an Aster I would think it looks more like my White Wood Asters in the early stage, though it may be a Campanula, not at all sure.

Thanks, Jay. It is what is surrounding the delphinium.