Sometimes referred to as Harebell, this long blooming perennial comes in more varieties than you can count, and the appearance of the plant can vary widely from selection to selection. 

The smaller varieties range from 4-12" tall, while the larger ones range from 15-36" tall.

Bloom time varies by type, but most campanula bloom from mid summer right into the fall, and boast shades of blue, purple and white.

Sun exposure: partial sun

Characteristics: deer resistant


Campanula glomerata (top right) by Dag Lindgren.

Campanula carpatica (bottom right) by Wikipedia user Qwertzy2. 

Both photos subject to the GNU Free Documentation License.