Botanical name: Platycodon grandiflorus
Common names: Chinese Bellflower, Balloon Flower
Family: Campanulaceae
Origin: East Asia
USDA Plant Hardiness Zone Map
The name Ballon Flower is based on the unopened flower buds which look like little balloons.
Good for the Rock garden, border or as a ground cover.
Link to this plant:
https://toptropicals.com/catalog/uid/platycodon_grandiflorus.htm