Eucalyptus delegatensis

RHS Plant Profile

alpine ash

Other common names

Tasmanian oak

Trees

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A large, majestic, evergreen tree with a straight clean trunk and bark in shades of brown, blue and white. It is shed in strips annually on the main branches, while being persistent on the trunk The tree has an open, airy canopy with dull green, slightly glaucous, lance-shaped leaves with conspicuous veins. Mature specimens are capable of reaching 60m (200ft) high, making them suitable only for larger gardens or parkland. White flowers are produced in clusters of up to fifteen in mid-summer which are very attractive to bees. All parts are aromatic.

Position

Full sun

Soil Types

Chalk, Clay, Loam

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

Chalk Clay Loam

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–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): H5

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: Correct

How to Grow

Cultivation

Grows well in most garden soils that are moisture-retentive but well drained and in full sun.

Propagation

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

Suggested planting locations and garden types

Architectural
Coastal
Mediterranean climate plants

Pruning

Pruning group 1 or, for best juvenile foliage, pruning group 7 For more information see Eucalyptus: pruning

Pests

May be susceptible to eucalyptus gall wasp and eucalyptus sucker

Diseases

May be susceptible to silver leaf, oedema and honey fungus