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Calamagrostis acutiflora 'Karl Foerster'

Common Name: Feather Reed Grass

A classic, upright ornamental grass prized for its strong vertical habit, early flowering, and four-season interest. Narrow green blades form a tight clump, topped in early summer by upright, wheat-like flower plumes that emerge purple-bronze and mature to golden tan, persisting well into winter.

Growth is clump-forming and non-invasive, maintaining a clean, architectural presence without lodging or spreading.

Growing Conditions

Light: Full sun to part shade

Soil: Moist, well-drained; adaptable to a wide range of soil types

Water: Average; drought tolerant once established

Cold Hardiness: Excellent winter tolerance

Hardiness

USDA Zones: 4a–9b

Mature Size

Height: 4–5 ft (5–6 ft in flower)

Width: 2–3 ft

Features

Strongly upright, vertical growth habit

Early-season flowering plumes

Excellent winter interest

Non-invasive, clump-forming grass

Landscape Uses

Mass plantings and drifts

Vertical accents and screens

Foundation and backdrop plantings

Naturalistic and formal gardens

Why Growers Choose It

One of the most reliable ornamental grasses available

Maintains form without flopping

Outstanding performance across a wide climate range

Plant Type:	Ornamental Grass
Width:	1-2'
Height:	3'
Fragrant:	Not verified
Fruit:	Yes
Growth Rate	Fast
Zone:	4–9
Deer Resistant:	Yes
Salt Tolerant:	Not verified
Drought Tolerant:	No
Exposure:	Full Sun, Partial Shade
Bloom Time:	Summer, Late Summer
Landscape/Use:	Mass Planting, Accent Plant
Shape:	Clump
Soil Type	Loamy
Leaf Color:	Green
Fall Color:	Green