Does it need full sun?

It prefers partial shade but will tolerate full sun in cooler climates.

How do I maintain it?

Simply comb through the clump in early spring to remove dead foliage.

Plant guide

Wavy hair-grass.

Avenella flexuosa

Pronounced ah-ven-EL-lah flex-yoo-OH-sah

Also known as Wavy Hair-grass, crinkled hairgrass, wavy hairgrass

Wavy hair-grass is a lovely, delicate perennial that thrives in acidic, well-draining soils. It features airy, cloud-like flower panicles that dance beautifully in the breeze. This grass is a fantastic choice for adding a soft, natural texture to woodland gardens or rockeries.

At a glance

Care level: Easy
Plant type: Perennial grass
Light: Partial shade to full sun
Indoor light: Bright indirect
Water: Every 3 to 7 days
Mature size: 1 to 2 feet
Growth rate: Medium
Hardiness: USDA 4 to 9
Bloom time: Early to mid summer

Care

Water when the top of the soil has dried out, as this grass prefers free-draining soil and tolerates dry spells once established. Watch for browning leaf tips, which often signal that the plant is getting too dry or the air is too hot. Trim back the foliage in late winter to make room for fresh spring growth.

Watering: Water when the top inch of soil feels dry to the touch.
Feeding: Apply a balanced, slow-release fertilizer once in early spring.
Pruning: Cut the plant back to the ground in late winter before new growth emerges.
Repotting: Repot when the plant becomes root-bound or the center of the clump starts to die back.
Soil: Acidic, sandy, or peaty soil
Soil pH: Acidic
Temperature: -30 to 25°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Perennial, typically 5 to 10 years.
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes
Water sitting on the surface for too long
Reduced vigor or stunted growth

Safety

People: There are no reports of toxicity in humans.
Children: The foliage is not poisonous, but the sharp leaf blades can cause minor cuts if children play with them.
Contact allergens: The leaf edges can be slightly sharp and may cause minor skin irritation if handled roughly.
Airborne allergens: The pollen can trigger seasonal allergies in sensitive individuals.
Edibility: This grass is not intended for human consumption.

How to identify it

Fine, bristle-like dark green leaves
Airy, purplish-bronze flower panicles
Clump-forming habit
Zigzagging flower stalks

Height: 0.3 to 0.6m
Spread: 0.2 to 0.4m
Leaves: green, semi-evergreen
Flowers: purple, bronze, gold, 0.5 to 1cm

Problems to watch for

Rust · Fungal infection causing orange or brown spots on the foliage during humid weather.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, autumn
Overwintering: Leave the foliage standing through winter to protect the crown and provide winter interest. Cut back to the ground in early spring before new growth appears.
In containers: It grows well in containers, provided you use a well draining, acidic potting mix.

Division

Dig up the clump in early spring.
Use a sharp spade or knife to divide the root ball into smaller sections.
Replant the divisions immediately at the same depth as the original plant.

Plant in groups of three or five to create a natural, drifting effect in the garden.

Grows well with

Foxglove · They share similar woodland conditions and provide a nice contrast in form.
Bluebell · This grass provides a soft green backdrop for spring blooming bulbs.

Similar species

Tufted Hair Grass · It is a larger, more robust relative that prefers moister soil conditions.

Science

Family: Poaceae
Genus: Avenella
Order: Poales
Class: Liliopsida
Native range: Temperate regions of Europe, Asia, and North America.
Conservation: It is common and widespread throughout its native range.

It is highly adapted to acidic, infertile, and well drained soils in open woodlands and heathlands.

Value to wildlife: larval host plant
Pollinators: butterflies, moths
Uses: ornamental grass, woodland gardens, erosion control, rock gardens

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 3/9
Light: 5/9
Temperature: 4/9
Moisture: 4/9
Nutrients: 2/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It prefers partial shade but will tolerate full sun in cooler climates.
How do I maintain it?: Simply comb through the clump in early spring to remove dead foliage.

Where the name comes from

Avenella is a diminutive of Avena, the Latin name for oats, while flexuosa describes the bent or wavy nature of the stems.

Good to know

The common name wavy hair grass refers to the delicate, zig zag appearance of the flower stalks.
It is a classic choice for naturalistic or prairie style plantings.
The foliage often takes on a lovely bronze tint in the winter.

Also in

Deer-resistant plants

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.