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Don't give up on evergreen coverage in zone 6 and colder. Five leaf akebia (akebia quinata) is supposedly hardy to zone 4 and is very vigorous. It will spread 10 ft or more in all directions, including up, but is easy to chop off so I wouldn't call it invasive. Many comments in PlantFiles report blue flowers and seed pods, but flowers are insignificant on my Z6 specimen.