tree

Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck

The Story

Plant Bio

Allocasuarina littoralis, known as the black she-oak, is an upright, evergreen Australian tree featuring a dense, conical crown and deeply fissured, dark grey-brown bark. It grows as a small to medium tree in sheltered sites but forms a coarse, wind-sheared shrub in exposed maritime environments.

The foliage consists of segmented, needle-like green branchlets where the true leaves are reduced to tiny scale-like teeth arranged in whorls of six to eight. In autumn and winter, male trees produce terminal, rusty-brown flower spikes while female trees bear small, bright crimson tufts that develop into woody cones.

Uses & Benefits:

Provides a unique fine-textured architectural form with weeping or ascending needle-like branchlets and decorative woody cones.

Serves as an effective windbreak or shelterbelt in exposed coastal and maritime environments due to its high salt tolerance.

Acts as a critical food source for the endangered Yellow-tailed Black-Cockatoo and supports native insects and insectivorous birds.

Essentials

At a Glance

Plant Type

Tree

Height

591 inches

Width

236 inches

Light

Full Sun, Partial Sun

Zones

8, 9, 10

Water

Low

Humidity

Moderate

Lifespan

Long

Native To

Eastern Australia

Toxicity

Non-toxic

Bloom period

Autumn – Spring

In flower about 7 months of the year

Planting

How to Grow

Select a site in full sun or partial shade with highly permeable, well-draining soil.
Dig a hole twice the width of the root ball but to the same depth, ensuring the plant sits level with the surrounding soil.
Backfill with native soil, firming gently around the base, and water thoroughly to settle the roots.
Apply a light layer of organic mulch around the root zone, keeping it clear of the main trunk to prevent collar rot.

Pro Tip

Never prune back into bare, woody branchlets; this species lacks dormant buds on old wood and will fail to shoot, causing permanent dieback.

Keep It Thriving

Care Guide

Do

Plant in highly permeable, well-drained soil.
Protect young tubestock from browsing possums with physical guards.
Allow the soil to dry out completely between waterings once established.

Don't

Never prune hard back into old, leafless, woody branchlets.
Do not plant in poorly drained heavy clay depressions where water pools.
Avoid heavy applications of general-purpose fertilisers.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Pest Check
Plant
Propagate
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

WindbreakScreeningCoastal GardenRevegetationSpecimen Tree

Companion Plants

Banksia spinulosa Leptospermum laevigatum Correa reflexa Themeda triandra

Multiply

Propagation Methods

Good to Know

Common Questions

Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck questions

What zones can Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck grow in?

Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck bloom?

Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck typically blooms in autumn through spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck need full sun?

Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck drought tolerant?

Yes — once established (usually after the first full season), Black She-oak, Black Sheoak, River Black-oak, Bull Oak, Wayetuck handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.