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Kudzu is a fast-growing vine native to the subtropical regions of China and Japan. The leaves of the plant contain 3 broad oval leaflets with purple flowers and curling tendril spikes. Because kudzu produces stems that can grow to 20 m (60 ft) in length with extensive roots, it has been used to control soil erosion. Since its introduction to the United States, kudzu has become well established and proliferates in moist southern regions, where it grows vigorously and is now considered an invasive pest.