Picea pungens (Glauca Group) 'Koster'

RHS Plant Profile
Colorado spruce 'Koster'

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Colorado spruce 'Koster' Dorling Kindersley 2003
Colorado spruce 'Koster' RHS

Synonyms

Picea kosteri 'Glauca'
Picea pungens 'Koster Compacta'

Conifers Trees
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An evergreen conifer making a small to medium-sized tree of neat, conical habit, with prickly, vivid silvery-blue foliage

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

2.5-4 metres

Size

Time to Maturity
20–50 years
Max Spread
2.5-4 metres
Max Height
8-12 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Neutral

Position

Full sun
Aspect
West–facing or South–facing or North–facing or East–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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Pinaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright
Genus
Picea are evergreen trees with rigid, needle-like leaves arranged singly all round the shoots, and narrow, leathery-scaled cones borne near the ends of the shoots
Name Status
Accepted

How to Grow

Cultivation

Grow in moist but well-drained acidic soil. Shelter from cold drying winds. See conifer cultivation for more advice

Propagation

Propagate by grafting or semi-hardwood cuttings

Suggested planting locations and garden types

  • Architectural
  • Low Maintenance

Pruning

No pruning required

Pests

May be susceptible to adelgids, red spider mite and conifer aphid

Diseases

May be susceptible to honey fungus