Platycodon grandiflorus.

Receiving a Christmas card from my dear friend Robyn in Germany was extremely exciting. Once I had seen the stamp with a 'ballonblume' on it, I immediately researched it!

Platycodon grandiflorus, "Balloon Flower".
(Herbaceous perennial.)

Planting: Spring. Deep, moist but well-drained soil.
Flowering: Summer.
Aspect: Part shade - full sun.
Hardiness: Hardy, even in cold winters if sheltered.

Notes: Known as doraji 도라지 in Korea, its root is often found in salads. When I am next in the Far East, I shall seek it out!