Festuca glauca Intense Blue ('Casblue'PBR)

RHS Plant Profile
blue fescue [Intense Blue]

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Other common names

blue fescue 'Casblue'

Synonyms

Festuca glauca 'Casblue'PBR
Festuca glauca 'Ice Blue'

Award of Garden Merit
Grass Like
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Position

Full sun

Soil Types

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

Position

Full sun
Aspect
East–facing or South–facing or North–facing or West–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
Deciduous
Habit
Tufted
Genus
Festuca can be herbaceous or evergreen, rhizomatous grasses with linear, often strikingly coloured, leaves, and dense or lax panicles of brownish flowers in summer
Name Status
Trade

How to Grow

Cultivation

Grow in poor to moderately fertile, well-drained soil in full sun. Divide every few years in late winter or early spring to maintain vigour. See ornamental grasses cultivation

Propagation

Propagate by division in late winter or early spring

Suggested planting locations and garden types

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

Pruning

Comb out dead foliage in spring and trim off damaged parts on older foliage

Pests

Generally pest-free

Diseases

May be susceptible to a rust