Platycodon grandiflorus 'Astra Blue', commonly known as Astra Blue Balloon Flower, is a compact, clump-forming perennial featuring large, star-shaped blue flowers that bloom from mid-summer to early fall. Thriving in full sun to partial shade and well-drained soil, this variety is ideal for borders, rock gardens, and containers. The bright blue blooms of Astra Blue attract bees and butterflies, adding a cool, refreshing color to the garden.