Mulga acacia tree native to arid outback areas of Australia. It is the dominant tree in the habitat .During dry periods, mulgas drop much of their foliage to the ground, which provides an extra layer of mulch and from where the nutrients can be recycled.Phyllodes are modified petioles or leaf stems, which are leaf-like in appearance and function.The needle-like phyllodes stand erect to avoid as much of the midday sun as possible and capture the cooler morning and evening light. Any rain that falls is channeled down the phyllodes and branches to be collected in the soil immediately next to the trunk, providing the tree with a more than threefold increase in effective rainfall. Mulga roots penetrate far into the soil to find deep moisture. The roots also harbour bacteria that fix atmospheric nitrogen and thus help deal with the very old, nutrient-poor soils in which the species grows. Mulga was a vital tree to indigenous Australians in Central Australia; the wood was a good hardwood for making various implements, such as digging sticks, woomeras, shields and wooden bowls