Korean Feather Reed Grass

Calamagrostis brachytricha

Poaceae

• Full sun to partial shade
• 3-4' tall × 2-3' wide (flower plumes to 5')
• Type: Cool-season ornamental grass
• Drought Tolerant: Moderate – more drought tolerant than it appears; prefers moderate moisture but adapts to drier conditions
• Evergreen: No
• Flower Color/Bloom Time: Silvery-pink to purple-tinged feathery plumes fading to buff, August–October
• Wildlife Benefits: Seed heads attract birds; dense foliage provides cover for insects and small wildlife; late-season pollinator interest

Korean Feather Reed Grass (Calamagrostis brachytricha) is a graceful, clump-forming ornamental grass distinguished from most other ornamental grasses by its exceptional tolerance for shade and partial shade — a rare trait in the grass world that makes it invaluable for difficult, low-light garden situations. Unlike its close relative Karl Foerster Feather Reed Grass (Calamagrostis acutiflora), which demands full sun, Korean Feather Reed Grass performs admirably in dappled shade, woodland edges, and north-facing borders while also tolerating full sun in cooler climates. It adapts well to a range of soils including moist, average, and moderately dry conditions in Spokane.

Korean Feather Reed Grass forms an upright, arching clump of bright green foliage that remains handsome through the growing season. In August, it produces an exceptionally showy display of fluffy, softly arching plumes in a distinctive silvery-pink to light purple hue — one of the most beautiful and unique flower colors available in ornamental grasses. These plumes gradually fade to a warm buff tan as they mature and persist attractively through fall and into winter. Autumn foliage transitions to soft gold-tan tones. The overall form and movement of the plant is elegant and naturalistic, avoiding the stiff upright quality of some reed grasses.

The late-season bloom of Korean Feather Reed Grass coincides with the peak of pollinator season and the beginning of fall migration, making it particularly valuable for wildlife. The showy plumes attract native bees and other late-season pollinators, while the maturing seed heads provide food for finches, sparrows, and other seed-eating birds through fall and into winter. The dense, upright clumps offer nesting cover and habitat for beneficial insects. Its value as a late-season resource makes it a meaningful addition to wildlife-friendly gardens in the Spokane area.

The shade tolerance of Korean Feather Reed Grass opens up planting possibilities unavailable to most ornamental grasses. It is outstanding for woodland garden edges, shaded borders under high-branching trees, north-facing slopes, and transitions between sun and shade in the landscape. In sunnier locations it pairs well with other ornamental grasses and perennials including Karl Foerster Feather Reed Grass, Coneflower, Aster, Rudbeckia, and Switchgrass. It is an especially valuable companion for shade-garden favorites such as Hosta, Astilbe, and Solomon's Seal. Cut back to 4"–6" in early spring before new growth emerges.