How do experts decide when species are invasive?

An invasive species is both non-native to the ecosystem in which it is found and capable of causing environmental, economic, or human harm because of its ability to spread rapidly and compete with native species. This means that not all non-native species are considered invasive. read more

As far as I’m aware, a species is considered invasive when it thrives someplace outside its historic habitat to such an extent that it negatively affects endemic species. read more

Most states have an exotic or invasive species council. Join your local council, and ask about ways you can help and for a list of noninvasive alternatives to use for landscaping. 1. Pimentel, D., R. Zuniga, and D. Morrison. 2005. Update on the environmental and economic cost associated with alien-invasive species in the United States. read more