Plant Library

Calamagrostis x acutiflora 'Karl Foerster'

Karl Foerster Feather Reed Grass

A classic, upright ornamental grass prized for its strong vertical habit, early-season flowering, and exceptional four-season interest. Narrow green foliage forms a tight, clump-forming base, 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 clean, uniform, and non-invasive, maintaining a crisp architectural presence without flopping 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


Formal and naturalistic gardens


Why Growers Choose It


One of the most reliable ornamental grasses available


Maintains form without lodging


Outstanding performance across a wide climate range

Minimum zone

5

Maximum zone

8

Height

4'

Width

2.5-3.5'