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Campanula americana, the American bellflower, [3] or tall bellflower, [4] is a bellflower native to eastern North America. Tall bellflowers can be annual or biennial with a varying life-history with seeds germinating in the fall producing annual plants and spring-germinating seeds producing biennial plants .
This tough rockery plant bears sprays of violet starry flowers in spring and summer. Vigorous and fast growing, it is able to stand drying out once established in a wall. It will self-seed into cracks in walls and paving. During winter, it survives best at 5–10 °C (41–50 °F), but can tolerate both colder and warmer temperatures.
Campanula (/ k æ m ˈ p æ nj ʊ l ə /) [4] is the type genus of the Campanulaceae family of flowering plants. Campanula are commonly known as bellflowers and take both their common and scientific names from the bell-shaped flowers — campanula is Latin for "little bell".
Campanula carpatica is a low-growing herbaceous perennial. Plants possess basal leaves and thin, white rhizomes. Stems grow up to 45 cm long. Flowers are solitary and stand on stalks ranging from 10–15 cm long. Flowers are purple in colour and plants bloom from June to August. [4]
The difference between Campanula mollis and this species is the shape of the leaves. [5] Volume 6 of The American journal of horticulture and florist's companion said that the flowers are of a most lovely blue color and last a considerable long time. [6] When potted, plants grow well in airy temperate conditions.
Campanula cochleariifolia (also Campanula cochlearifolia), common name earleaf bellflower [1] or fairy's-thimble, [2] is a species of flowering plant in the family Campanulaceae, native to the Pyrenees, Alps, French Massif Central, and Carpathian Mountains of Central Europe.