http://extension.oregonstate.edu/gardening/node/948 English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest English ivy is an invasive weed in the Pacific Northwest