The striking contrast of the red and green on Japanese Knotweed appealed to gardeners who imported the plant as an ornamental shrub. Now it poses a severe problem as it takes over many areas like the banks of the Delaware River. The plant is resistant to pesticides and reproduces itself from any piece that reaches the ground. Its growth is so dense that it kills native plants. Its root structure does not hold the soil so in times of flooding it allows erosion and travels in the waters to new habitats.

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