Wavy hair-grass
Avenella flexuosa · Poaceae
📷 Botaurus · Public domain
The gardener's calendar
Ideal time to plant wavy hair-grass: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, fine and supple
- Blooming
- May to June, reddish-brown spikelets
- Mature height
- 30 to 50 cm
- Growth
- Moderate to fast
- Hardiness
- Very hardy (down to -20°C)
- Origin
- Europe, Western and Northern Asia
- Soil type
- Well-drained, slightly acidic, poor to moderate
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
A fine and delicate grass that thrives in partial shade where it won't get scorched. Light soil, moderate moisture, no excess.
The common mistake
Forcing it into full sun: it bleaches and dries out.
The pro's trick
Plant it in groups of 3-5 for optimal airy effect.
Seasonal watch
In very wet autumn-winter periods, waterlogged soil weakens it.
Care
Watering
Hair grass prefers fresh but well-drained soil. Water regularly in the first year to establish the root system, then gradually reduce. This ornamental grass tolerates drought well once established and needs little additional watering in temperate climates.
Light
Plant in partial shade to part sun for optimal development. It also tolerates full sun in cool and humid regions. Avoid areas that are permanently too hot and dry.
Soil and drainage
Hair grass appreciates well-drained, slightly acidic soil that is poor to moderate in nutrients. It adapts to various soil types but dreads waterlogging. Rocky, sandy or sloped terrain promotes good growth.
Pruning and tidying
Comb or cut the foliage in late winter or early spring to remove dead parts and encourage new growth. You can also leave the clump in place if you enjoy its winter appearance. Avoid harsh cutting during the growing season.
Fertilizing
No fertilizer is necessary. This grass thrives in poor to moderate soils, and enriching the soil risks promoting excessive growth and a less compact form. Light compost at planting is sufficient.
Health and prevention
Hair grass is very hardy and rarely affected by disease or pests. Good drainage prevents root rot. No treatment is usually necessary if growing conditions are respected.
Did you know?
Hair grass gets its scientific name 'flexuosa' from its delicate flower heads that wave gracefully in the wind. This grass is a traditional feature of acidic heathlands in Western Europe, where it forms characteristic landscapes alongside heather and gorse. Appreciated by modern landscapers, it brings subtle lightness and movement to contemporary and natural gardens.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Tufted hair grassDeschampsia cespitosa
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- Common quaking grassBriza media
- Creeping soft-grassHolcus mollis
- Rough reedgrassCalamagrostis arundinacea
Tips generated and checked by Viridia — adapt them to your local climate.