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Platycodon is another member of the Campanulaceae Family (bell flower). It is a very winter hardy perennial. It can withstand 3 degree temperature. It is native to East Asia.
It's roots are edible and often used in Korean cuisine. These roots are also used to make soft drinks as well as liquors.
Platycodon has the common name 'Balloon Flower'. As can be seen in the picture below, the flower inflates before opening, having somewhat the shape of a balloon.