Sideroxylon inerme, commonly known as the white milkwood, is a low-growing evergreen tree indigenous to South Africa. Several individual White Milkwood trees have been declared National Monuments in South Africa due to their role as silent witnesses to major historical events. It is found growing naturally in coastal regions, from the Cape Peninsula to northern Zululand. The tree’s common name comes from the milky latex it produces, which discourages browsing by animals.

This species can reach a mature height of 10 to 15 meters and has a large, dense, rounded crown. The small, greenish-white flowers bloom from November to April and emit a strong, unpleasant odor. After flowering, the tree produces small, purplish-black fruits, which also contain milky latex. The bark is initially smooth when young but becomes rough and grey-brown to black, with rectangular cracks as the tree matures.

Sideroxylon inerme is well known for its long lifespan, often living for over 500 years. While frost-tender, it can withstand long periods of drought and high temperatures. It is frequently planted as a firebreak due to its moisture-rich foliage, which is resistant to fire. Today, the white milkwood is a protected species in South Africa.

The tree also supports local wildlife, attracting bees and butterflies, making it an excellent choice for wildlife-friendly gardens. Its dense crown provides ample shade, making it suitable for recreational areas. When planted in rows around a property, white milkwood trees can form an impenetrable hedge, offering both privacy and protection.