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Silver Spike Grass

Achnatherum calamagrostis

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Silver Spike Grass (Achnatherum calamagrostis) at Greenbloom Landscape Design

Silver Spike Grass

Silver Spike Grass

(Photo courtesy of NetPS Plant Finder)

Silver Spike Grass (Achnatherum calamagrostis) at Greenbloom Landscape Design

Silver Spike Grass flowers

Silver Spike Grass flowers

(Photo courtesy of NetPS Plant Finder)

Plant Height:  28 inches

Flower Height:  4 feet

Spread:  3 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  5a

Other Names:  Spear Grass, Needle Grass, Stipa calamagrostis


This fine-textured grass produces stunning silvery plumes in early summer that mature to tan, and persist into winter; this grass sways beautifully in a breeze; a graceful addition to the garden or border

Ornamental Features

Silver Spike Grass features airy plumes of silver flowers held atop the stems from early to mid summer. Its attractive threadlike leaves are emerald green in colour. As an added bonus, the foliage turns a gorgeous gold in the fall. The tan seed heads are carried on showy plumes displayed in abundance from late summer to late winter.

Landscape Attributes

Silver Spike Grass is a dense herbaceous perennial grass with a shapely form and gracefully arching stems. It brings an extremely fine and delicate texture to the garden composition and should be used to full effect.

This is a relatively low maintenance plant, and is best cleaned up in early spring before it resumes active growth for the season. It has no significant negative characteristics.

Silver Spike Grass is recommended for the following landscape applications;

  • Mass Planting
  • Rock/Alpine Gardens
  • Border Edging
  • General Garden Use

Planting & Growing

Silver Spike Grass will grow to be about 28 inches tall at maturity extending to 4 feet tall with the flowers, with a spread of 3 feet. Its foliage tends to remain dense right to the ground, not requiring facer plants in front. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 20 years.

This plant does best in full sun to partial shade. It does best in average to evenly moist conditions, but will not tolerate standing water. It is not particular as to soil pH, but grows best in rich soils. It is somewhat tolerant of urban pollution. This species is not originally from North America. It can be propagated by division.

Hardiness Zone Plant Height Minimum Sunlight
Massing  Rock  Edging  Garden 
Flowers  Fruit  Foliage Color  Fall Color  Texture 
Ornamental Features

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