Anemonastrum deltoideum

Common Names

Threeleaf Anemone, Columbian Windflower, Western White Anemone

Summary

Columbian windflower, also called western white anemone, is a rhizomatous perennial herb native to forests along the west coast of the United States, typically 10–30 cm tall. It usually has a single basal leaf divided into three large, coarsely toothed leaflets up to 6 cm long, with additional leaves along a mostly bare stem. The inflorescence carries three leaflike bracts and a single white flower formed by five petal-like white sepals 1–2 cm long; petals are absent, and up to 120 whiskery stamens surround many pistils, with fruit comprising a cluster of spherical achenes.

In cultivation, it occurs in low to middle elevation forests (100–2000 m) and tolerates open to shaded woodland habitats; blooms April–July depending on elevation. Prefers a cold, shady site with humus-rich, moist soil; alpine house or shade may be used; propagation via seed in winter (barely covered), germination 3–6 months at 10–13°C, or division after flowering and in fall; garden-friendly and suitable as a lawn alternative or in landscaping.

Lifecycle

Perennial

Height

4-12 inches

Spread

4-12 inches

Sunlight Requirements

Ideally partial shade, tolerates full sun and full shade.

Soil Type

Humus-rich, moist to mesic soil

Soil Drainage

Moist, humus-rich soil

Bloom Color

White

Bloom Time

Spring and Summer

Foliage Color

White

Fall Foliage Color

Unknown

Leaf Lifecycle

Deciduous

Growth Rate

Spreads vigorously

Seasons of Interest

Spring and Summer

Propagation Methods

Seeds, Division

Attracts Wildlife

Attracts bees (including bumble bees)