Invasive plant is a name for a species that has become a weed pest, a plant which grows aggressively, spreads, and displaces other plants. These are non-native species that have often been introduced outside of their natural range for agricultural or landscaping purposes, though not all non-natives become invasive. Invasive species grow so prolifically that they crowd out native vegetation, and quickly become difficult to control. Infestations can become so severe that they degrade animal habitats. Surprisingly, many invasive species are readily available at local landscaping suppliers.
Plants are designated as invasive on this website based on their behavior in the upper Ohio Valley. However, behavior varies regionally, so you should check references related to your area, expecially if you are planning to plant a non-native.
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