This herbaceous, clump-forming perennial is native to Kashmir, northern India, Tibet, and southwest China. The leaves are dark green and deeply three-lobed. The flowers have five pure white petals tinged with blue on the reverse and steel-blue anthers. They are about an inch across, saucer-shaped, and borne on stiff stems in clusters of three to five in summer. The specific name, rivularis, means “brook-loving”, and refers to the fact that these plants like moist soil that never dries out.
Type: Herbaceous perennial
Bloom: White flowers with steel-blue stamens are produced in clusters of three to five in summer.
Size: 24” H x 12” W
Light: Dappled shade (tolerates more sun with adequate moisture)
Soil: Fertile, humus rich, moist, well-drained
Hardiness: Zones 6-8
Care: Water during times of drought; do not allow to dry out.; prune after flowering to encourage second flush.
Pests and Diseases: slugs, eelworms, caterpillars, powdery mildew
Propagation: Fresh seed; division in late summer t early fall
Companion plants: Northernmaidenhair fern (Adiantum pedatum), Sword fern (Polystichum munitum), hosta, Lenten rose (Helleborus orientalis), Tiarella cordifolia, Trilllium grandiflora, toad lily (Tricyrtis formosana).