Nicknamed the 'Bellflower', Campanula plants are highly versatile perennials, best known for their starry purple blooms. With some low-growing, and others growing as tall as one metre, there exists the perfect Campanula plant for every garden! If you are working with a hanging basket, 'Blue Sky' will present a cascading show of blue flowers, while Campanula persicifolia makes a beautiful, cottage garden staple with its racemens of trumpet-shaped blooms.