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Bottle Brush Grass

Elymus hystrix (EL-ih-mus HIS-triks)

Family: Poaceae Native Herbaceous (3-15 ft)

Bottlebrush grass is a native perennial, ornamental, cool-season grass of the Northern, Central, and Eastern United States that grows 2.5 to 3 feet tall, and is usually found in woodland areas. It has a fibrous root system and forms erect clumps of grass with unbranched culms. The leaves are linear, grayish-green to dark green, simple, and alternate, with a rough texture. Its airy, spiky flowers form mid-June and are greenish and bristly, resembling a bottlebrush, and rise above the leaves. As they mature, they become brown and last into October. It is a member of the grass family (Poaceae). The genus name Elymus is derived from the Greek word elymos , or the name used for a type of grain. The specific epithet hystrix , meaning "hedgehog." This is derived from the appearance of this grass's seedheads, resembling the quills of a hedgehog. Prefers partial shade to light shade and adapts to a variety of soil conditions, including moist to dry, clay, sandy, or loamy soils. It is drought-tolerant, shade-tolerant, erosion-tolerant, and able to thrive in urban sites. It is low-maintenance and easily propagated by seed. In ideal conditions, it will self-seed and form small colonies, but it is not aggressive. In late winter, it is best practice to cut back the old foliage and seedheads before the new growth occurs. Attracts butterflies and is a larval host of the Northern Pearly Eye ( Enoida anthedon ). Birds and the white-footed mouse enjoy eating the seeds, while livestock enjoy the foliage. However, the bristly seedheads can cause mouth injuries to livestock. This ornamental grass, with its interesting seed heads, adds texture to the garden. It would be a delightful addition to a shaded woodland garden or naturalized site. The bottlebrush grass's long flower stems can be added to floral arrangements for added interest. Insects, Diseases, and Other Plant Problems: No significant insect or disease concerns. Monitor for aphids and leaf spot. Unfortunately, in some states ( for example, Maine), this grass is vulnerable to urban expansion. ,Drought-tolerant

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 61 attributes.

How it fits the guild

Guild layer 4 - Herbaceous (3-15 ft) Optimal soil pH Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Full plant profile

Growing Conditions
Plant type
Native Plant; Ornamental Grasses and Sedges
Life cycle
Perennial
USDA zones
5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
Light
Dappled Sunlight (Shade through upper canopy all day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Clay; Loam (Silt); Sand
Soil pH
Neutral (6.0-8.0)
Soil drainage
Good Drainage | Moist
Available space
Less than 12 inches; 12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 2 ft. 6 in. - 3 ft. 0 in. | Width: 1 ft. 0 in. - 1 ft. 6 in.
Growth rate
Medium
Maintenance
Low
Canopy layer
4 - Herbaceous (3-15 ft)
Form & Appearance
Habit / form
Clumping; Erect
Texture
Coarse
Leaf color
Gray/Silver; Green
Leaf type
Simple
Leaf arrangement
Alternate
Leaf shape
Linear
Leaf margin
Undulate
Leaf feel
Rough
Leaf size
> 6 inches long, < 1 inch wide
Hairs present
Yes
Leaf detail
The leaves grow in tufts, and each blade is grayish-green to dark green, narrow, grass-like, and rough, measuring up to 12 inches long and about 0.5 inches wide. The leaves are pubescent on the upper surface and have stiff hairs or may be smooth underneath.
Flower color
Brown/Copper; Green
Flower value
Good Cut; Showy
Flower form
Raceme; Spike
Flower size
> 6 inches
Flower detail
The flowerheads form at the end of the aerial stem and are a spike-like raceme. They are initially green and cylinder-like during the summer, measuring 9 to 10 inches long, and resembling a bottlebrush. Each spikelet measures 1 to 2 inches long and has 2 to 4 florets. The fertile florets have pale yellow stamens and a white style. As the flowers mature in late summer, they transition to brown and remain present through the fall.
Bloom time
Fall; Summer
Fruit type
Caryopsis
Fruit size
< 1 inch long, < 1 inch wide
Fruit detail
The spiklets turn brown when they mature, and the florets will fall off, leaving a pair of bracts (glumes) remaining. The glumes are dry, leaf-like bracts or husks that protect the seeds, and measure 0.5 inches long. At the base of the floret is a pair of bracts known as a lemma and palea. A fertile lemma is 8 to 11 mm long, and its tip extends into a straight awn (bristle-like appendage) that is up to 1.5 inches long. The sterile lemmas are smaller and have a shorter awn. The paleas resemble the lemmas but do not have awns. Fruit displays from July to September.
Stem color
Green
Stem detail
The culm (aerial stem of grass) is green, smooth, unbranched, and circular in cross-section. At the terminal end of the culm, the flower presents as a spike-like raceme.
Wildlife & Ecology
Native status
Native
Origin
North, Central and Eastern U.S.A
Distribution
Native: AL, CT, DC, IL, IN, IA, KS, ME, MD, MA, MI, MN, MO, NE, NH, NJ, NY, NC, ND, OH, PA, RI, SD, TN, VT, WV, and WI. Introduced: Austria, Germany, and New Mexico.
Wildlife value
Seeds attract birds and the white-footed mouse. Larval host plant for the Northern Pearly Eye butterfly..
Attracts
Small Mammals; Songbirds
Host plant for
Northern Pearly Eye butterfly
Play value
Attractive Flowers; Easy to Grow; Wildlife Food Source; Wildlife Larval Host
Food & Medicine
Harvest time
Summer
Fruit type
Caryopsis
Landscape Use
Landscape location
Naturalized Area; Riparian; Woodland
Landscape theme
Garden for the Blind; Native Garden; Rain Garden
Garden tags
#NC native #bird friendly #food source herbage #food source hard mast fruit #food source summer #piedmont mountains UPL #coastal UPL #Audubon #wildlife friendly #rain garden #dry soils tolerant #erosion control #problem for horses #shade garden #livestock browsing plant #larval host plant #cut flower #problem for cattle #butterfly friendly #small mammals #summer interest #summer flowers #problem for sheep #urban conditions tolerant #flower arrangement #clay soils tolerant #low maintenance #grass #drought tolerant #woodland garden #gray-green leaves #green leaves #fall interest #self-seeding
Problems & Resistance
Problems
Problem for Horses
Resistant to
Black Walnut; Drought; Dry Soil; Erosion; Heavy Shade; Pollution
Particularly resistant to
Drought, black walnut, poor soil, erosion, urban conditions, pollution
Propagation
Division; Seed

Planted at Hunnicutt

Nobody’s planted this one yet.