English Ivy is a vine which is not native to the Pacific Northwest. It is used domestically as a ground cover (often to stabilize ground), and also as a climbing vine on buildings where it may look attractive. However, in the wild, it is bothersome weed, and left unchecked, can drastically degrade the habitat it is in as it climbs into trees and may literally strangle them. Unfortunately, birds tend to eat and spread the berries, and there seems to be a high rate of seed germination, so this plant spreads rapidly! Many clubs and groups make a point to pull it or cut it to help restore the environment.