This grower is sure of this plant identification.
Peach-leaved bellflower, Willow bellflower, Peach bells, Bellflower
Campanula persicifolia (Peach-leaved bellflower). This perennial will produce medium green lance-shaped leaves and pretty clusters of bell-shaped, delicate flowers with papery petals which will form a bell-shape. The foliage will form a basal rosette.
They are fully to half hardy and are grown in the sun or shade. Most of the species will prefer moist but well drained soil. Delicate flower colours are preserved best in shade.
Border, mixed bed or ground cover. Summer interest.