Australian Sandalwood

Santalum spicatum is a slow-growing hemiparasitic tree or shrub, typically reaching 3–6 metres in height, that draws water and nutrients from the root systems of neighbouring host plants while photosynthesising independently. Its fragrant heartwood, the source of commercially valuable sandalwood oil, forms only after decades of growth. The species produces small, inconspicuous flowers followed by nut-like fruits that are dispersed by birds and mammals, and within arid and semi-arid ecosystems it contributes to soil stability and provides food resources for native fauna.

The species is found across Western Australia, where it is widespread, and extends into southern South Australia. It occupies a range of habitats including forest margins, shrubland, desert fringes, and coastal supratidal zones, often persisting in disturbed or artificial terrestrial landscapes alongside agricultural land.

Population decline stems from a combination of pressures. Historical and ongoing harvesting for its valuable oil-bearing wood has removed mature, seed-producing individuals. Clearing for annual and perennial cropping and livestock grazing has reduced suitable habitat and host plant availability, while road and rail infrastructure fragments remaining stands.

Altered fire regimes, prolonged drought, and competition from invasive species further limit natural regeneration, and grazing by livestock and feral herbivores suppresses seedling survival.

Conservation responses include regulated harvest quotas, plantation establishment to reduce pressure on wild populations, and research into host-plant relationships to improve regeneration success. Some populations occur within protected reserves, and replanting programs have been undertaken in parts of its range.

Despite these measures, natural recruitment remains low across much of its range, and the population trend is classified as decreasing. Continued harvesting pressure, land clearing, and climatic stress suggest the species will require sustained management intervention to stabilise wild populations over the coming decades.