Acacia mearnsii, a fast-growing leguminous tree, is native to southern hemisphere regions. Over time, black wattle has been introduced and cultivated in various other continents, particularly noted for wide presence in temperate and tropical areas. Black wattle is found in both hemispheres but has been particularly successful in cultivating in similar climates to its native range. While black wattle has been beneficial for some uses, in certain areas it is sometimes thought to be a competitor to native species and may have an impact on local ecosystems. Despite this, black wattle continues to be cultivated and may be welcomed for its utility in certain regions.

Black wattle is a fast-growing spreading shrub or an erect tree that is used as an ornamental plant and for making poles, fences, tool handles and similar items. In spite of its usefulness and attractive looks, this plant is widely considered an invasive environmental weed. It is especially harmful in India and South Africa.

Black wattle regenerates and grows quickly, so it can get very hard to remove it. Cutting the tree down and digging out the entire root system sure is effective, but it is also very time-consuming if the tree is big. An easier method of eradicating black wattle includes girdling, but it can take a few years until the part of the plant above the peeled layer dies. Girdling doesn't address the problem of new root suckers, so if you opt for this method of removal keep in mind that you must remove new sprouts every year. Alternatively, you can apply herbicides to the girdled area or the cut stump in order to kill off the root and its suckers. If you want to avoid herbicide use, there are also some effective biological agents, for example, flower-galling midge (Dasineura rubiformis) and a pathogenic fungus called Cylindrobasidium laeve. If you opt for herbicide use, consult an agricultural expert before you pick the active substance, and follow the instructions on the product label carefully. Spray only black wattle plants, and perform the treatment on a windless day to avoid drift.