Allocasuarina littoralis aka Bull Oak

Allocasuarina littoralis is an evergreen tree from eastern and southeastern Australia. Its range includes Queensland, New South Wales, Victoria and Tasmania. Names include black sheoak, bull oak and Wayetuck. It belongs to the Casuarinaceae family. It grows on coastal heath and in open forests. Wild plants often grow on poor sandstone soils. Despite its coastal name, it also grows well inland.

In gardens, it reaches about 26 feet [8 metres] tall and wide. Some trees reach 49 feet [15 metres]. On exposed coasts, it may form a coarse shrub. Growth is fast, and the crown is dense. Branches often start low on the trunk. Its fine, modified branchlets look like leaves. Red flowers appear in spring, and the tree bears seed cones. Male and female flowers grow on separate plants. Both sexes must be present to produce seed.

Give this tree full sun and soil that drains well. It prefers soil that holds some moisture, but tolerates drought. It grows in sand, loam and clay, including poor, shallow ground. Acid to neutral soils suit it. It also tolerates very acid soils and some salt. Its native range spans cool regions and warm, wet tropics. Sources report cold tolerance down to about 23°F [-5°C]. Plants For A Future lists USDA zones 9–11. Coastal winds carrying salt do not rule out its use.

The dense crown suits a hedge, screen or windbreak. Its shallow, spreading roots can help hold sandy soil. Soil microbes help the tree fix nitrogen. The bark provides tannins used in tanning. Its hard, heavy wood serves for furniture and tool handles. Builders also use it for joinery, shingles and farm buildings. The wood provides fuel and material for charcoal. These uses explain its value beyond the garden.

Reported edible parts include gum and cones. People chew the gum or dissolve it in hot water. The resulting liquid can form a jelly. The sources give no preparation details for cones. They list no known medicinal use. Useful Tropical Plants reports no known hazards. This does not establish safety for every person or pet. Both plant-use sources flag weed potential, without describing its severity. The supplied evidence names no specific pests or diseases.