Wild fig, or ivy?
My husband and I argue but whatever this plant is, it is a marketplace for bees, robins and hummingbirds it has taken over what was once the Skelton of a dead cherry tree and become a huge block of plenty.
@roachling what else I love, is it seems to be the only plant in my acres of redwood and spell trees, that isn't always invaded and overcome by wild blackberry brambles