Campanula rapunculoides reaches on average 30–80 centimetres (12–31 in) of height. The inflorescence consists of nodding spikelike racemes with numerous drooping flowers. The flowers are bright blue-violet (rarely white), 2 to 4 cm long, with short petioles standing to one side in the axils of the bracts.
This plant is native to Europe and western Siberia and it has been introduced to North America, where it has become an invasive weed. It grows on grassy places, dry hills, meadows, in deciduous and pine forests, woods, fields and roadsides, along railway lines and hedgerows, preferably in partial shade, in dry to moist sites and on clay soils, relatively rich in nitrogen, at an altitude of 0–2,000 metres (0–6,600 ft) above sea level. It also occurs in cultivated fields as a weed.