Impatiens arguta (Hardy Impatiens)

Zone: 6 - 9
Natural Range: Nepal
Soil:  Moist, humus rich
Light:  Shade, part sun
Attributes:  Deciduous, 2' tall and 3' wide.  Bluish purple blooms that keep blooming late spring through fall.
Notes:  Very cold hardy and produces non stop flowers.  They do best when mulched with leaves and pulled off late winter.