Sure it's labour intensive to adjust the topography but once it is done it shouldn't need continuous maintenance, as shown in the end of the clip. I also suspec

Sure it's labour intensive to adjust the topography but once it is done it shouldn't need continuous maintenance, as shown in the end of the clip. I also suspect that the fragility is due to it being so newly established. If the foliage is allowed to become dense and put down proper roots over time it should become more robust.