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John leland, a natural historian, defines a weed as a “plant out of place.” The Bureau of Land Management (BLM) states that weeds constitute “any plant growing where it is not wanted.” Weeds can be native or nonnative, invasive or noninvasive, and noxious or nonnoxious. According to the Animal and Plant Health Inspection Service of the U.S. Department of Agriculture, a weed is “any plant that poses a major threat to agriculture and/or a natural ecosystem.” This particular definition is significant because it highlights the economic and ecological impact that weeds can have on human communities, landscapes, and natural ecosystems. Some weeds have been categorized as “noxious” by federal agencies and state and local governments. A noxious weed is a plant that poses a ...

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