PlantFiles: Balloon Flower, Chinese Bellflower, Japanese Bellflower
Platycodon grandiflorus 'Fuji White'

Grows well in zone 6 in partial sun. Blooms profusely on first round in late July. Individual flowers don't last all that long, but there are so many of them that the plant is in bloom a long time. If deadheaded will rebloom in about mid Sept. My 'Fuji White' has about 95% pure white flowers, but does always have a few 'mutant' flowers that are splashed or streaked with purple (which is really interesting as they are always different).

Plant does usually require minimal staking to prevent sprawling. So far haven't found it prone to any pests or diseases.

Seed collecting is super-easy! Upon final bloom leave spent flowers on the plant until mostly dried out. This will take a few weeks, and you can tell when they are ready because they will shrink up some and when you gently squeeze them they will feel firm and dry. Then simply cut the stalk and place in a paper bag. Allow to dry completely for a week or so, shake the bag, and the seeds will simply fall out of the seedhead.