How did noxious weeds get here?

Most noxious weeds come from Europe or Asia. Seeds or plant fragments are unknowingly transported to new areas where they are spread and grow into plants. Many noxious weeds have been sold as ornamental plants that have escaped home gardens and spread into the wild.

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1. How did noxious weeds get here?
2. What are noxious weeds?
3. What are the weed lists?
4. What do I do if I have one of these weeds?
5. What does the law say about noxious weeds?
6. Whom do I contact about tall weeds?
7. Why are noxious weeds a problem?