Does anyone have any reccomendations for a tall narrow plant? It needs to grow to at least 5 m but due to space constrictions it musn't get too wide. Also, its going to be next to a garage so highly invasive roots are a no-no. Oh, its for screening due to new house being built behind us. Any ideas would be greatfully accepted!
One of the more vigorous climbers can be trained and trimmed to the right width. I have a Clematis Montana which regularly gets past the upstairs house windows but only grows as wide as the supporting trellis.