Koeleria glauca

RHS Plant Profile
grey-blue koeleria

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grey-blue koeleria RHS 2002
Grass Like
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A semi-evergreen perennial grass forming a compact tuft of narrow grey-green leaves and, in summer, silvery-green, cylindrical flowering panicles

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Alkaline or Neutral

Position

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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

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