Answer: Unfortunately, flowering vines really need to sun to grow well and bloom. This would be true for both annuals and perennials. You could experiment with the fall blooming sweet autumn clematis (Clematis paniculata, sometimes listed as C. terniflora) and see if it can manage to bloom for you, it will tolerate part shade although it too is a sun lover. The more direct sun it can get, the better. It is hardy into zone 4, but I would mulch it heavily in late fall each year. Maybe you could selectively thin a few tree branches to allow more sun to reach it?
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