platycodon

Platycodon (Platycodon grandiflorus)

Balloon Flower

Full sun to part shade, medium moisture, well-drained loam; tolerates clay with moderate drainage; pH 5.5–7.0.

1–3 feet tall by 1–1.5 feet wide depending on cultivar; blooms midsummer (July–August in Middle Tennessee) with large balloon-shaped buds opening to star-shaped blue, white, or pink flowers; slow to emerge in spring — mark placement to avoid disturbing the taproot; spreads minimally by seed; long-lived once established.

Avoid disturbing the fleshy taproot; plant in spring and do not divide — plants resent root disturbance and are best left undisturbed for many years.

Native region: Not native to Tennessee; ornamental introduction from eastern Asia (China, Japan, Korea, eastern Siberia).

Balloon flower is among the most reliably perennial ornamentals for the Zone 6b/7a transition zone. The midsummer bloom period fills a gap between the spring and fall perennial waves. The taproot makes it drought-tolerant once established but intolerant of transplanting. It emerges late in spring — as late as May in Middle Tennessee — and is easily damaged by overzealous spring cleanup; mark planting sites with durable labels. Compact cultivars such as 'Sentimental Blue' and 'Astra Blue' are less prone to flopping than tall single-stemmed selections. Deer occasionally browse emerging shoots; mature plants with toughened foliage are rarely damaged.