Answer: This vine blooms on new growth of the season so you can prune it back as much (or as little) as you like during the winter or early spring to control size. With such a small trellis, you may want to trim it back very hard -- it becomes more rampant each year for the first few seasons then settles into a steady fast growth pattern. Pruning in the summer however will remove flowering wood. As far as winter preparation, after frost apply a heavy mulch such as shredded bark over the root zone but do not allow it to touch the stems. Enjoy your trumpet vines!
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