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Plant library  ·  Ornamental Grasses

Feather Reed Grass

Calamagrostis x acutiflora

Feather Reed Grass is a perennial ornamental grass that builds a narrow vertical presence rather than a broad, arching mound. At about 5 feet tall and 2 feet wide, it gives mixed borders a strong upright line while leaving more horizontal room for neighboring plantings. Early wheat-like plumes carry the display from early summer into fall, and the standing form can continue to give the bed definition in winter.

  • Deer resistant
Sunlight Full Sun
Water Moderate
USDA zones 4–9
Spacing 2.5 ft
Mature size 5 ft tall, 2 ft wide
Bloom Early summer - fall

Placement and use

Use this grass as a vertical punctuation point in a sunny border, at a bed corner, or in a repeated row beside a long path. Its upright clump suits narrow planting bands where a wider grass would crowd circulation or spill into lower plantings. Place it behind shorter perennials or mid-border where its flowering stems can rise above the surrounding layer without blocking a route or a key view across the garden.

Spacing and mature footprint

Plant Feather Reed Grass 2½ feet apart, center to center, for distinct upright clumps that read as a rhythm rather than a solid screen. Its mature width is about 2 feet, so this leaves a modest gap for air, mulch, and access around each base. In a repeated drift, keep the planting line far enough back from paths that the mature foliage and flower stems do not narrow the walking zone.

Three plants set 2.5 ft apart, center to center; shaded circles show the 2 ft mature spread.

Sun, water, and soil

Reserve a full-sun position and provide moderate moisture, especially where the planting receives reflected heat or competes with thirsty shrubs. Soil that stays consistently moist without becoming stagnant supports the strongest growth; the grass can also handle heavier clay ground. Avoid placing it in a spot that routinely dries hard, since its upright display is best maintained with dependable moisture.[1][2]

Seasonal notes

The plumes emerge in early summer, then become more buff-toned as the season advances and can remain useful through much of winter. Leave the old stems standing where their winter outline is welcome, then cut the clump to the ground in late winter before new shoots begin. Allow clear access from a path or bed edge for that annual cleanup.[1][2]

Planning caveats

Although it tolerates some shade, reduced light can mean fewer plumes and a looser, less upright habit. Give it the sunny side of taller shrubs, fences, and structures rather than using it in a deeply shaded back corner. In exposed sites, reserve a little extra clearance around the clump so wind-shifted stems do not interfere with paths or neighboring plants.[1][3]

Growing facts

Botanical name
Calamagrostis x acutiflora
Type
Ornamental Grass
Category
Ornamental Grasses
Lifecycle
perennial
USDA hardiness zones
4–9
Sunlight
Full Sun
Water
Moderate
Plant spacing
2.5 ft
Mature size
5 ft tall, 2 ft wide
Bloom season
Early summer - fall
Pollinator friendly
No
Deer resistant
Yes
Native to North America
No

References

  1. Feather Reed Grass - Calamagrostis x acutiflora — North Carolina Extension Gardener Plant Toolbox
  2. Calamagrostis × acutiflora - Plant Finder — Missouri Botanical Garden
  3. Calamagrostis / RHS Plant Guide — Royal Horticultural Society

Editorial content updated 2026-07-20.