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Grass Like

Koeleria glauca

grey-blue koeleria

A semi-evergreen perennial grass forming a compact tuft of narrow grey-green leaves and, in summer, silvery-green, cylindrical flowering panicles

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

West–facing or East–facing or South–facing or North–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Poaceae
Native to GB / Ireland: No
Foliage: Semi evergreen
Habit: Tufted
Genus: Koeleria can be annual or perennial grasses, forming compact tufts of linear leaves, with narrow silvery flowering panicles in summer
Name status: Correct
Plant range: Europe to C Asia

How to grow

Cultivation

Grow in medium to light, moderately fertile soil. Thrives in shallow chalky soil but is tolerant of acid conditions

Propagation

Propagate by seed sown in situ in spring or autumn or by division in mid-spring

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Rock garden
Patio and container plants
Low Maintenance
Flower borders and beds

Pruning

Cut back old, flowered stems before seeding or in autumn

Pests

Generally pest-free

Diseases

Generally disease-free

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.