I have it from a plant swap some years ago. It grows vigorously here in SE MN with seedlings actually coming up now. Id does seed prolificly, but they're easy to just pull or scratch out.

I've grown balfouri and glandulifera.The balfouri was beautiful and had a nice habit.The glandulifera had beautiful flowers,but here by Chicago it grew rather rough looking.The ones growing in the Northwest look much better.They are tall plants,more like our native wild impatien,and they both self seeded and came back after winter.