Campanula rapunculoides (purple bell) with freshly melted snow on its petals | November 2022
I just learned, in researching the name of this flower, that it is invasive in North America (native in central/southern Europe and western Asia). Very pretty color, but difficult to remove and spreads very effectively.
It [the purple bell] spreads by underground rhizomes and produces deep, taproot-shaped tubers. Both are white and fleshy. Because any piece of the roots can sprout into a new plant, it is extremely hard to eradicate.
https://en.wikipedia.org/wiki/Campanula_rapunculoides