All along the east side of my back garden is a row of shrub rose of variety "Knockout". The wooden fence is 5 feet high and the rose is nearly to the top. Knockout is a fairly new variety, extremely disease resistant, vigorous, and long blooming. I planted these about 5 years ago and they have grown to an impenetrable wall of thorn and bloom. Even Smokey is reluctant to crash through to bark at the neighbor's lawn mower.