What problems do invasive species pose?
Not all non-native plants are harmful. About one third of the vascular plant taxa in Massachusetts are non-native, but only about 7% of these plants are considered invasive. The 22 species listed on this site are those of highest priority due to their frequency in Concord, aggressive nature, and other factors. There are, however, more problematic plants in the bay-area then listed on this site. In an effort to decrease the spread and possible introduction of invasive plants, Massachusetts passed the Prohibited Plants List. Effective since 2009, it is a ban on the trading, selling, and distribution of certain invasive plants. For more information on the law and plants view the links page.

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1. What is an invasive species?
2. What problems do invasive species pose?
3. What are the advantages of native species?