Campanula

Campanula persicifolia (Peach-Leaved Bellflower)
Campanula persicifolia is a graceful, upright perennial known for its slender stems topped with bell-shaped blue or white flowers that bloom in late spring to early summer. Its airy form and classic cottage-garden look make it ideal for borders, cut-flower gardens, and mixed perennial beds.

Mature Size: 18–36 in tall, 12–18 in wide
Sun Requirements: Full sun to partial shade
USDA Zones: 3–8