Balloon Flower
Also known as
Balloonflower, Chinese Bellflower, Japanese Bellflower, Doraji, Jiegeng, Kikyō
Keep this plant’s care guide close at hand.
Get the appAbout Balloon Flower
Platycodon grandiflorus, commonly known as balloon flower, is a hardy herbaceous perennial in the bellflower family (Campanulaceae), prized for its unique balloon-like buds that inflate before opening into star-shaped blooms. Native to East Asia, it typically grows 12–24 inches (30–60 cm) tall and 12–18 inches (30–45 cm) wide, forming tidy clumps with lanceolate, blue-green leaves. Flowers appear from early to late summer in shades of violet-blue (most common), white, or pink, including double forms. It thrives in well-drained soil and full sun to partial shade, offering reliable color in borders, rock gardens, and containers. Balloon flower is long-lived, generally deer-resistant, and attracts pollinators. It has a deep, brittle taproot and dislikes disturbance, so choose its planting site carefully. Pinching stems in late spring encourages bushier growth and reduces flopping. Deadheading prolongs bloom, and light staking may be helpful in rich soils. With modest water and fertilizer needs, it’s an easy, low-maintenance choice for temperate gardens.
Taxonomy
Properties & Requirements
How to care for Balloon Flower
Water
Water consistently during establishment, keeping the top 1–2 inches of soil slightly moist but never soggy. Once established, balloon flower is moderately drought tolerant; water deeply when the soil has dried to a depth of an inch, roughly 1 inch of water per week in hot weather. In containers, check more frequently and water when the top inch dries. Always ensure excellent drainage to prevent root rot.
Light
Provide full sun (6–8 hours daily) for best flowering in cool to moderate climates. In hotter regions, aim for morning sun with light afternoon shade to reduce stress and flopping. It tolerates bright partial shade but may produce fewer blooms. Indoors is not recommended long term; grow outdoors where light and seasonal cues support dormancy and robust flowering.
Nutrients
Feed sparingly. Work in compost or a light application of a balanced, slow‑release fertilizer (e.g., 5‑10‑5 or 10‑10‑10 at half rate) in early spring. Excess nitrogen encourages tall, floppy growth with fewer flowers. Container-grown plants can receive a diluted balanced liquid feed monthly during active growth. Avoid feeding after midsummer to prevent tender late growth. Maintain soil fertility with annual compost and a light mulch.
Temperature
Hardy in USDA Zones 3–8, balloon flower tolerates winter cold well (to about -30°F / -34°C) and benefits from a natural dormancy. Ideal growing temperatures range from 60–80°F (15–27°C). In very hot climates, provide afternoon shade and consistent moisture. Protect young shoots from late hard frosts and avoid waterlogged winter soils, which increase crown rot risk.
