Looking for ideas to form an edge to our open plan garden, it's two sides, one borders the pavement, the other our neighbours shared driveway. We don't want anything too high (about knee high would be fine) or that needs a lot of work as we aren't gardeners :) The soil is clay and garden faces east and will get sun up until late afternoon. It's fairly exposed and we'd want it to stop people using the garden as a shortcut. So, not for security, just as a deterrent, therefore, wouldn't be overly upset if it had thorns...