This fairly large Impatiens species comes from the Himalayas and the seed is winterhard. It is an annual, but will come back each year, but only if the seeds have been exposed to frost, so do not try to grow it in a warm greenhouse. It will grow in most types of soil and will produce white flowers.
 

Impatiens glandulifera Candida

Impatiens glandulifera Candida