Eucalyptus bosistoana

RHS Plant Profile

Bosisto's box

Other common names

coast grey box

Trees

Majestic evergreen tree to 60m tall, endemic to SE coastal areas of Australia. Rough, thin, flaky bark mottled grey, and white or grey-brown patches, smooth bark on upper branches is white, cream or grey shedding in ribbons. Pale green ovate juvenile leaves 7cm long become glossy green lanceolate adult leaves 20cm long. White flowers in umbels from midsummer to autumn, followed by rounded or barrel-shaped woody fruits

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

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
Coastal
Mediterranean climate plants
Sub-tropical

Pruning

Pruning group 1, or for the best display of juvenile foliage use Pruning group 7. 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