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More than a century is the length of time that Japanese knotweed has been in the United States of America. The invasive plant in question (Polygonum cuspidatum) may have been introduced sometime in the late 1890s to control erosion and screen landscapes. Unfortunately, its tolerance of drought, heat, salinity and shade was counterbalanced by takeovers of low-lying areas, riverbanks, stream-sides, utility rights-of-way and waste places.

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Q: How long has Japanese knotweed been in the United States?
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Japanese knotweed is such a good competitor because it forms thick, dense colonies that crowd out any other herbaceous species and is now considered one of the worst invasive exotics in parts of the eastern United States. The success of the species has been partially attributed to its tolerance of a wide range of soil types, pH and salinity. Its rhizomes can survive temperatures of −35 °C (−31 °F) and can extend 7 meters (23 feet) horizontally and 3 meters (9.8 feet) deep, making removal by excavation extremely difficult. The plant is also resilient to cutting since it vigorously re-sprouts from the roots.


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