Platycodon grandiflorus (Balloon flower) 9 cm Pot

Growth habit & appearance:Platycodon grandiflorus is a clump-forming perennial with distinctive inflated flower buds that open into broad, five-pointed violet-blue stars. Its upright stems carry smooth ovate foliage and produce a tidy architectural mound. The plant’s ballooning buds are visually striking and highly ornamental, giving strong late-summer presence in the herb garden. Grown from seed in our nursery, plants are robust and well-adapted to Irish conditions.

Growing conditions:This is a hardy perennial suited to full sun in Ireland, thriving even in cooler summers. It prefers well-drained soil enriched with organic matter and benefits from a light compost mulch each spring. Once established, it tolerates frost well, reliably overwintering outdoors. As it dies back fully in winter, mark its position to avoid accidental disturbance. Not native to Ireland but grows reliably in Irish gardens.

Traditional & herbal uses:The root of Platycodon grandiflorus is widely used in East Asian herbal traditions for respiratory complaints. Peer-reviewed studies note its content of triterpenoid saponins such as platycodin D, associated with expectorant and soothing effects on the upper respiratory tract. Traditionally it has been used for coughs, sore throats, tonsillitis, hoarseness, phlegm congestion, and wheezing. Roots are typically harvested when mature. For wildlife value, its star-shaped flowers are rich in nectar and attract native pollinators, especially solitary bees and hoverflies, making it an excellent addition to wildlife-friendly herb beds.

Maintenance & harvesting:Mulch annually with compost to support new growth. Stems can be cut back after flowering or left until complete dieback in autumn. Roots are traditionally harvested from mature plants—typically after several years of growth. Allow the soil to drain freely, as excessive winter wet can cause crown rot. Once fully dormant, the clump can be carefully divided if expansion is needed.