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Acacia mearnsii trees flowering alongside a small river
acacia mearnsii
Acacia mearnsii (Black Wattle)

Originating in the southeastern regions of Australia and Tasmania, this species serves a pivotal role in local ecosystems. It becomes a vital pioneer following the frequent bushfires in the Australian wilderness, binding the erosion-prone soil and facilitating swift regeneration of the bushland. Its expansive root system provides increased nitrogen levels, assisting the growth and recovery of other woodland species. Typically reaching heights between 23 and 33 feet, its branches stretch nearly to the ground, adorned with clusters of fragrant, pale-yellow flowers. The tree has found its way to various parts of the world, where it's valued as a commercial source of tannin—an essential compound used in industries such as leather production and wine and food manufacturing. Capable of thriving in a range of climates—from warm, temperate dry climates to moist, tropical regions—it's also earned a reputation as one of the world's worst invasive species. Photographed in Santa Marta and the department of Quindio, Colombia, where it has naturalized at elevations below 10,000 feet.


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