Answer: I would wait until late winter or early spring to prune it. You can prune it back quite hard to control overall size and to encourage branching near the base, you would also remove any winter damaged tips. It blooms on new growth of the season, so do not prune it in the summer as this would remove flowering wood. New vines often take a year or two or three to settle in, become rooted, and bloom to their full potential. However, keep in mind this plant does require full sun to set buds -- all day direct sun is best but at a minimumn six hours including the hour of noon, and it should not be overfertilized as excessive nitrogen can encourage foliage growth at the expense of blooms. I hope it blooms for you next summer!
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