Found recently in Pittsfield, Hardy kiwi is a twining, woody vine that is native to east Asia and which can grow up to 20 feet per year. Hardy Kiwi threatens forests in western Massachusetts through complete domination of mature trees. Hardy Kiwi can germinate and grow under a closed canopy and climb surrounding vegetation, eventually killing its support. The vine then spreads to surrounding trees, opening larger gaps in the forest over time.
See these links below for more information on Hardy Kiwi.