I'm interested in planting Boston Ivy to cover a concrete block wall, and looking forward to the 'fall colors' it displays prior to losing its leaves. I have no experience with this plant, and would like some assurance that, with diligent and regular pruning, it can be kept cropped close enough to the wall so as not to protrude more than about 4 inches and encroach on a walkway. All suggestions and caveats welcome, thanks!