Wallangarra white gum

Sun

Full sun; choose a sheltered position in colder districts.

Water

Water regularly while establishing. Once established, it tolerates dry periods, though prolonged drought can cause canopy decline.

Soil

Well-drained soil, preferably slightly acidic to neutral; avoid compacted ground and sites that stay wet in winter.

Height

40-70 ft (12-21 m)

Spread

20-35 ft (6-11 m)

Flowers

Small white flowers in clusters, usually in summer; timing varies with climate.

Foliage

Evergreen. Narrow, pointed, green leaves hang from slender branches and release a eucalyptus scent when crushed.

Growth

Fast in suitable conditions.

Care needed

Medium

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Needs looking after

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   10 ft (3.1 m)

3. After 2 years

   14 ft (4.2 m)

4. After 3 years

   18 ft (5.3 m)

5. After 5 years

   25 ft (7.6 m)

About 13 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Native to

Australia

Growth rate

Fast

• Plant a young, container-grown tree without disturbing its root ball; avoid specimens with tightly circling roots.
• Water deeply through the first two growing seasons, allowing the soil surface to dry between waterings.
• Spread organic mulch over the root zone, keeping it clear of the trunk.
• Avoid routine heavy feeding; use a modest amount of slow-release fertilizer only if growth is poor and a nutrient shortage is likely.
• Stake only if the root ball moves in wind, use flexible ties, and remove supports once the tree is stable.
• Allow ample clearance from buildings, drains, paving and overhead wires.

Pruning. In late winter or early spring, remove dead, damaged or crossing branches and establish a sound framework while the tree is young. Avoid topping or repeatedly reducing a mature tree; have large limbs assessed and pruned by a qualified arborist.

Spring

Plant in colder districts once severe frost has passed, and water thoroughly.

Late spring

Check young trees for frost damage and prune back dead shoots once new growth reveals what has survived.

Summer

Water establishing trees deeply during dry spells and inspect stressed foliage for psyllids.

Autumn

Plant in mild-winter districts where soil drains freely; refresh mulch without covering the trunk.

Winter

Check stakes and ties after storms, and inspect the crown for damaged branches.

Late winter

Carry out light formative pruning on young trees before vigorous spring growth.

• Use as a single specimen in a large lawn, where the white trunk can be seen clearly.
• Set against dark evergreen planting to emphasize the pale bark and fine-textured crown.
• Combine with drought-tolerant grasses and shrubs in a spacious Australian-native garden.
• Place toward the rear of a large border to provide height and light, shifting shade.

Garden styles it suits: Australian native, Architectural minimal, Modern, Mediterranean, Wildlife garden and Winter interest.

Plant it with: Mat rush, Flax lily, Kangaroo grass, Westringia and Bottlebrush.

Wildlife: Flowers provide nectar and pollen for insects and, in Australia, nectar-feeding birds. Mature trees offer perches and shelter; suitability as food for native animals varies locally.

• Root rot and decline in waterlogged soil: improve drainage before planting; do not try to compensate with fertilizer.
• Eucalyptus psyllids can distort leaves or leave sticky deposits: keep young trees adequately watered, conserve beneficial insects and avoid unnecessary broad-spectrum sprays.
• Eucalyptus longhorned borers can attack stressed trees in regions where these beetles occur: avoid drought stress and trunk injury, and seek local advice if bark loosens or branches die.
• Frost can scorch foliage and kill young shoots: shelter young trees and wait until spring growth starts before removing damaged wood.

Eucalyptus leaves, bark and especially concentrated eucalyptus oil can poison cats, dogs, horses and people if swallowed. Significant ingestion can cause vomiting, weakness and neurological signs; concentrated oil can cause severe poisoning. Do not use the foliage as food or make home remedies from it.

• Narrow-leaved black peppermint (Eucalyptus nicholii)

  It also has narrow leaves, but mature trunks retain rough, fibrous grey-brown bark rather than the smooth white bark of Wallangarra white gum.

• Snow gum (Eucalyptus pauciflora)

  It generally has broader, thicker adult leaves with prominent veins running roughly lengthwise, and often a more spreading or crooked habit. Wallangarra white gum has narrower leaves and a more upright trunk.

Wallangarra refers to the town near its restricted native range on the Queensland–New South Wales border, while scoparia means broom-like, referring to its foliage.

Propagation. Usually grown from seed, sown thinly on a free-draining seed compost and only lightly covered. Keep moist but not saturated, provide bright light, and move seedlings into individual pots while small to limit root disturbance.

Accepted botanical name

Eucalyptus scoparia

Native range

Queensland.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.