Acacia Tree Add-onAcacia Tree Blue Bush, Pearl Acacia, Halfmoon Knife leaf Acacia & Willow Wattle This awesome soil improving tree or shrub explodes with hot yellow blossoms in mid spring and summer. Fast growing and very low water acacia's make a great hot inland or coastal climate tree. They hold their leaves all year and the annual prunings necessary to keep their shape help to release nitrogen into the soil. Blue Bush Acacia covenyi Extra blue leaved form with