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Aggressive and invasive plants

Q.  What is the difference between aggressive and invasive plants?

A.  The Chicago Botanic Garden defines an invasive plant as “a species, usually nonnative, that is able to establish itself within existing native plant communities and is posing a threat to the integrity of the community.”

An aggressive plant is one that spreads faster than preferred, or into an area of your garden where it is unwanted. A plant may be aggressive in one area of a garden or neighborhood and well behaved in another.