Creeping Bellflower (Campanula rapunculoides), pretty purple-violet invasive weed, bell shaped flower growing in a flower garden

Creeping Bellflower is a perennial that originated from Europe and was brought over as an ornamental. Not only does it reproduce by seeds but it can spread by rhizomes. Creeping bellflower is a perennial weed that can cause serious problems in yard and garden, even though the blossoms are pretty. It is usually gown as an ornamental because of it pretty, bell-shaped blue to purple flowers.