Ecological Invasion
For the same reasons it is favored as an erosion-control plant, with its easy spreading and resilience, some varieties of acacia, are potentially an invasive species. One of the most globally significant invasive Acacias is Black Wattle Acacia mearnsii, which is taking over grasslands and abandoned agricultural areas worldwide, especially in moderate coastal and island regions where mild climate promotes its spread. Australian/New Zealand Weed Risk Assessment gives it a "high risk, score of 15" rating and it is considered one of the world's 100 most invasive species. Extensive ecological studies should be performed before further introduction of acacia varieties as this fast-growing Genus, once introduced, spreads fast and is extremely difficult to eradicate.
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