Campanula rotundifolia 'Olympica'
Other plants you might like if you grow bluebell.
abelia
Abelia 'Edward Goucher'
Abelia 'Rose Creek'
Adriatic bellflower
Campanula garganica 'Dickson's Gold'
African daisy
Arctotis hybrida
ajania
Ajania pacifica
Alps yarrow
Achillea distans
alternate-leaved butterfly bush
Buddleja alternifolia
American boneset
Eupatorium perfoliatum 'Milk and Cookies'
