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Northwest Blooms · Perennials

Astilbe japonica 'Washington'

Washington (japonica) Astilbe

Astilbe japonica 'Washington'
Family
Saxifragaceae
Height
24-30 inches tall
Width
18-24 inches wide
Flower color
Pure white, fading to pale buff
Foliage color
Glossy dark green, deeply divided leaves
Bloom time
Early to mid-summer
Light
Partial shade to full shade
Water
High
Maintenance
Low; remove spent flower heads and cut back in late fall or early spring
Growing zone
USDA Zones 4-9
Wildlife
Attracts bees and butterflies

About this plant

Astilbe japonica 'Washington' produces elegant plumes of pure white flowers, bringing a soft yet bright presence to shaded garden areas. Blooming in early to midsummer, the pristine flower clusters rise above dense, finely textured green foliage, creating a graceful and layered appearance. Originally developed for garden versatility, this cultivar combines well with other shade-loving plants, adding depth and luminosity to borders and woodland settings.

The delicate, feathery blooms maintain their form as they age, slowly turning a pale buff color, extending visual interest into late summer. 'Washington' is especially valued for its ability to create lush, full displays in low-light spaces, where its clear white flowers light up shaded corners. Ideal for fresh-cut arrangements, the long-lasting plumes also work beautifully as dried floral accents, making it a charming addition both indoors and out.

Works well in

Borders · Shade Gardens · Woodland Gardens · Pollinator Gardens · Rain Gardens

Companion plants

Hostas · Bleeding hearts · Solomon's seal · Ferns · Lungworts · Wild ginger

Design tip

The long summer show pairs well with plants that peak earlier, keeping one area interesting for months. Keep it out of hot afternoon sun and layer it with woodland companions for a full, settled look.

Where to see it

This plant can be seen at the Center for Urban Horticulture.