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Pinus coulteri

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© RHS 1999

Characteristics

Plant type

Conifer or Tree

Habit

Bushy, Columnar/Upright

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Pale Yellow in Spring

Foliage

Blue and Grey/Silver in Autumn, Spring, Summer and Winter

Fruit

Brown in Winter

Size

Ultimate height

Higher than 12 metres

Ultimate spread

wider than 8 metres

Time to ultimate height

more than 50 years


Preferred common name

big-cone pine

Family

Pinaceae


Pinus can be shrubs or large, evergreen trees, some species with attractive bark, developing an irregular outline with age and bearing long needle-like leaves in bundles of 2, 3 or 5; conspicuous cones may fall or remain on the tree for years

P. coulteri is a large evergreen tree with a broad, open crown. Stout shoots bear thick, blue-grey needles up to 35cm long, in bundles of three. Massive pale brown cones to 30cm long, with a spine on each scale

Other common names

  • Coulter pine
  • Coulter's pine

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing
  • Exposed or Sheltered

Cultivation

Grow in any well drained soil in full sun

Soil

  • Well-drained
  • Acid, Alkaline or Neutral
  • Sand, Clay, Chalk or Loam

Propagation

Propagate by seed sown in containers in a cold frame in late winter. Retain in pots for at least two years

Suggested planting locations and garden types

Coastal or Architectural


How to care

Pruning

Generally no pruning required. Remove competing leaders and, on older trees, crown lift by removing some of the lower branches

Pests

Pine adelgid and sawfly may occur

Diseases

May be affected by honey fungus, various needle cast diseases and tree rust