Arrowfeather Threeawn

Arrowfeather Threeawn

By James H. Miller, USDA Forest Service, Bugwood.org - Image Number 1120297 at Forestry Images, a source for forest health, natural resources and silviculture images operated by The Bugwood Network at the University of Georgia and the USDA Forest Service., CC BY-SA 3.0,

Aristida purpurascens
Family: Poaceae (Grass Family)

Arrowfeather Threeawn (Aristida purpurascens) is a fine-textured native warm-season bunchgrass found throughout the southeastern United States, including Southeast Texas. Valued for its delicate, airy appearance and adaptability to dry conditions, this ornamental grass is ideal for naturalistic landscapes and prairie restorations. Its distinctive seed awns give it a soft, feathery texture in late summer and fall.

• Scientific Name: Aristida purpurascens
• Common Names: Arrowfeather Threeawn, Purple Threeawn
• Family: Poaceae (Grass Family)
• Growth Habit: Perennial bunchgrass
• Height: 1.5 to 3 feet
• Leaves: Narrow, rolled, wiry green blades
• Flowers/Seedheads: Slender seed stalks with long, purple-tinged awns
• Bloom Time: Late summer to fall
• Wildlife Benefits: Provides cover for small animals; seeds eaten by birds

Habitat & Range in Southeast Texas

Arrowfeather Threeawn naturally grows in:

• Open Prairies & Grasslands: Prefers full sun and open areas
• Dry Sandy Soils & Slopes: Adapted to well-drained, low-fertility soils
• Savannas & Piney Woods: Common in upland areas with periodic fire

This species is drought-tolerant and thrives in dry to moderately moist soils.

Ecological Importance

• Erosion Control: Fibrous roots help stabilize soil in upland habitats.
• Biodiversity Value: Supports habitat structure for insects, birds, and small mammals.
• Native Grassland Indicator: Presence indicates a healthy, native plant community.

Landscaping & Gardening Uses

Arrowfeather Threeawn is an attractive ornamental for native or drought-tolerant gardens:

• Meadow & Prairie Gardens: Adds soft texture and movement with its fine foliage.
• Xeriscaping: Low water requirements make it ideal for dry landscapes.
• Wildlife Gardens: Offers habitat and nesting cover for ground-dwelling wildlife.

Planting & Care

• Sunlight: Full sun
• Soil: Well-drained, sandy or rocky soils
• Water Needs: Low; highly drought-tolerant
• Maintenance: Minimal; cut back in late winter if desired
• Companion Plants: Pairs well with Little Bluestem (Schizachyrium scoparium), Black-eyed Susan (Rudbeckia hirta), and Rattlesnake Master (Eryngium yuccifolium)

Fun Facts

• The name "Threeawn" refers to the three long bristles (awns) extending from each seed.
• Often used in native plantings to mimic the appearance of natural prairie grasses.
• Its purplish seedheads catch the light and sway in the breeze, adding visual interest.

Conservation & Native Plant Advocacy

Arrowfeather Threeawn contributes to native grassland diversity and provides critical structure in prairie habitats. Including it in your landscape supports regional restoration goals and enhances ecological resilience.

Where to Find It