What is a noxious weed? They are plants that have been identified as harmful to the environment or agricultural crops, ecosystems, people, or to livestock. Most noxious weeds have been introduced by accident or without regard to their potential to become their own type of pest. Aggressive growers, they multiply quickly and are hard to control. They can also cause adverse effects when in contact or ingested. Noxious weeds are a worldwide problem.
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