ACACIA HYBRIDS

In 1960, a group of Australian botanists arrived in Việt Nam with the aim of introducing sixteen different cultivars of wattle into the country. Thirty years later—following the withdrawal of Australian personnel and the end of the Vietnam War—an unusual hybrid of Acacia mangium (Hickory Wattle) and Acacia auriculiformis (Northern Black Wattle) emerged in the Central Highlands of Việt Nam. Investigating this new hybrid, the Vietnamese Academy of Forest Sciences (VAFS) and Australia’s Commonwealth Scientific and Industrial Research Organisation (CSIRO) launched a collaborative research and emerging plant cloning program.

These novel trees not only improved soil nitrogen but also grew to 25 to 30 metres in just five years; producing a straight and dense bole with potential to become a commercially viable hardwood product. Their ability to thrive in degraded soils convinced the Vietnamese government to plant these hybrid Acacia seedlings on an industrial scale. Since a quarter of South Việt Nam’s forests had been defoliated and destroyed by Agent Orange and heavy bombing, these hybrid trees filled a vital ecological role in reducing the severity of monsoon flashfloods and landslides. Becoming a cornerstone of forest regeneration initiatives like the Chương trình phủ xanh đất trống, đồi núi trọc (the Regreening the Barren Hills Program).

Between 1992 and 1997, US$68 million was invested to replant degraded forests and promote an emerging renewable timber industry. By 2026, Việt Nam grows over 2.2 million hectares of hybrid Acacia, making the country the world's largest wattle producer and the leading global supplier of renewable hardwood timber. Now fully acclimatised, these trees continue to spread across the landscape, profoundly reshaping agricultural practices while placing new ecological and economic pressures on the biodiversity and Indigenous knowledge systems embedded throught Việt Nam’s forest estates.