Eucalyptus calophylla

RHS Plant Profile
red gum

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Other common names

marri

Trees

Evergreen tree endemic to south west Western Australia, to 40m tall or more, with brown to grey-brown rough bark that exudes a rust-coloured sap. Broadly lance-shaped juvenile leaves are 12cm long, and adult leaves to 15cm long, both glossy green. Clusters of bristly cream flowers towards the end of summer are followed by large woody urn-shaped fruits 5cm long, which are an important food source for native birds

Position

Full sun

Soil Types

Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
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)
H3

Colour & Scent

Fragrance Foliage
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Myrtaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Spreading branched
Genus
Eucalyptus are evergreen trees or large shrubs, often fast-growing, some with attractive bark, most with aromatic foliage, and clusters of small, white, yellow or red flowers
Name Status
Unresolved

How to Grow

Cultivation

Outdoors grow in fertile, well-drained, neutral to acid soil in full sun with shelter from cold winds. Grow tender species outdoors in mild or frost-free counties only. See eucalyptus cultivation

Propagation

Propagate by seed at 13-18°C in spring and summer

Suggested planting locations and garden types

  • Architectural
  • Mediterranean climate plants
  • Sub-tropical

Pruning

Pruning group 1, or for the best display of juvenile foliage use Pruning group 7. See Eucalyptus: pruning for more detailed advice

Pests

May be susceptible to eucalyptus gall wasp and eucalyptus sucker

Diseases

May be susceptible to silver leaf, oedema and honey fungus