Thank you, Patches. So you'lll be growing it a container? I don't know . . . I've never done it. When you grow perennials in containers, the containers need to be bigger, and the plant needs to be hardier than you would otherwise expect, as the earth is not acting as an insulator. With platycodon you should be ok.
Why not give it a try, Patches. I have some Platycodons who reseed themselves all over, even in nearby pots. I just pull up the ones in unfortunate places and let the others fight it out with the local flora.