Why are noxious weeds a problem?

Noxious weeds are often pretty, but their effects are not. The absence of natural enemies in the new environment means weeds can spread uncontrollably, vastly reducing the number of native plants. This affects wildlife that depends on native plants for food; therefore, an increase in noxious weeds results in decreased native wildlife populations.

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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?