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I live in Seattle and English Ivy is incredibly invasive across the Puget Sound area and all over the Western Pacific Northwest. The pictures I just found online don't do it any justice. It totally blankets forests and chokes out all the native plants.
If you hike trails in the Seattle area greenbelts everything is thickly covered in this shit and it takes a lot of work from volunteer groups to constantly battle it in the parks and greenbelts.