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The tumbleweed, or Russian thistle, has become an icon of the American West, celebrated in songs and movies. But, in reality it is an invasive species that causes great harm to other plants, animals, and humans. It thrives in dry conditions when other plants struggle. It was brought to the Great Plains from the steppes by mistake, in sacks of flax seed, by immigrants to South Dakota in the 1870s. It has defied attempts by agricultural scientists and state and federal government agencies to control or eliminate it.
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