The Running Postman, the red flowered species, is a prostrate scrambler that grows quite flat and trails over rocks and soil, so it would be well displayed falling over a wall. The black flowered sp. is a very vigorous climber, twining its way skyward by any means of support including trees, sheds and large pergolas - and even then the buildings would be smothered with rampant growth that seems completely undeterred by pruning or hacking. tn.