How big does Blue hair grass grow?

About 40 cm × 30 cm after ten years (height × width). Its ultimate size is 15–60 cm × 15–30 cm.

What soil does Blue hair grass grow in?

It tolerates these soils: sandy, calcareous, average garden soil.

Is Blue hair grass hardy?

Hardy down to -29 °C (USDA zone 4, RHS H7). It gets through winter in every part of the country.

When does Blue hair grass flower?

Flowering: May–July, green, silver.

How much water does Blue hair grass need?

Water need: low. Drought tolerance: high.

How much does Blue hair grass cost?

It sells for roughly €4.20 to €8.10 in local shops, depending on size.

Blue hair grass

Koeleria glauca

Blue hair grass (Koeleria glauca) is an ornamental grass that reaches 40 cm × 30 cm after ten years. Light: full sun. Hardy down to -29 °C. Drought tolerance: high. Sold in local shops from about €4.20.

Illustration of Blue hair grass — An illustration of the typical shape of the mature plant, not a photo.

What it's good for, and what it isn't

A small, hedgehog-like tussock of steel-blue blades that is native to the dry, lime-rich sand grasslands of the region, so it is happiest in full sun and poor, loose, dry soil. Glossy flower spikes rise above the leaves in early summer and fade to cream; use it as edging, in rock and gravel gardens or planted in numbers. Keep it out of rich, moist or heavy soil, where it dies out within two or three years.

Watch out for

A short-lived grass: in fertile, irrigated or heavy, wet soil it often dies after only 2 to 3 years, with the centre of the clump going bald and dying out first. It lasts longer on poor, sharply drained sand; divide tired clumps in spring or replace them with young plants. It stretches and flops in shade. In the summer heat of Central Europe it may go partly dormant and look dull, which is not a disease. No serious pests or diseases.

Key facts

Light: Full sun
Water need: Low
Care: Low
Size after 10 years: 40 cm × 30 cm
Hardiness: down to -29 °C
Foliage: Semi-evergreen
Flowering: J F M A M J J A S O N D May–July, green, silver

Group	Ornamental grass
Light	Full sun
Size after 10 years	40 cm × 30 cm
Ultimate size	15–60 cm × 15–30 cm
Hardiness	down to -29 °C (USDA 4, RHS H7)
Soil	Sandy, Calcareous, Average garden soil
Foliage	Semi-evergreen
Flowering	May–July, green, silver
Water need	Low
Drought tolerance	High
Maintenance	Low
Root aggressiveness	Low
Suckering	no data
Spreading	Low
Distance from buildings	no data
Distance from paving	no data
Litter	not typical
Planting distance	25 cm
For dogs	no data
For cats	no data
For children	no data
Typical price	from about €4.20

Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor.

Sizes and prices available

The same plant is sold as a small pot and as a specimen several metres tall, and the price follows. Prices are rounded and for guidance only.

Size	Typical price
size not stated	approx. €4.20 – €8.10

Frequently asked questions

Data updated: October 8, 2026 · How our data is made

Appears in these lists

Ground cover plants Drought-tolerant plants Drought-tolerant plants for sandy soil Plants for containers Ornamental grasses Plants for a Mediterranean garden Rock garden plants

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