Pretty but tough plants to secure boundary
Hello, I live in a terraced house with a driveway to the front. The only thing separating my driveway from next doors is a flower border approx 7.5m long and 0.5m wide. It is currently planted with box balls, echinacea, catmint, verbena, alliums & lavender. The problem is that next door is rented out as a holiday let on a weekly basis and because their driveway is quite tight I have a succession of people trampling my plants with their car doors and feet as they alight and then the walk up my driveway before trampling back over my plants further up. My box balls are ruined with lots of broken stems and verbena and alliums have also been picked by various people's children. I find this infuriating and want to plant something that will be pretty (I like a mainly white colour scheme with blue and purple accents) but it quite tough and big enough not to be stepped over. I am not allowed to plant a hedge. Any advice very gratefully received.