Tall Bellflowers along the edge of the woods near my
home in northeast Iowa. USA
Campanula americana, Tall Bellflower or American Bellflower, reaches from three to more than six feet in height, its blue-violet blooms providing a bright late-summer accent to savanna or woodland plantings.
Self-seeding, it is either annual or biennial by habit, seemingly depending on when germination occurs. First-year plants are tight rosettes of triangular leaves that bolt the following spring to form tall stems, which exude milky sap if broken or cut. Because Campanula americana is the only bellflower with wide-spread petals, a petal tube that elongates with age and stamens that extend over the petals, it often is assigned the special designation Campanulastrum americanum.