Thank you for the feedback. I had already given it some thought and the following advantages arise for me from privet: - relatively narrow to keep as a hedge - relatively low water requirement - useful for birds - inexpensive - evergreen (wintergreen) My decision was basically made. Only my mother-in-law made me check/reconsider this again. I had read somewhere (don't remember where) that privet can form runners.
Not every privet is evergreen. Our privet (not evergreen) is now over 30 years old, very woody, and will mostly be removed. On the east side, the neighbor is currently building a natural stone wall, and on the west side we border a poor meadow anyway, which we also want to extend onto our property and only have the farmer mow twice a year. In the vegetable garden, I have already noticed that about 75 cm in, the plants grew less lush and the yield was lower due to the privet roots or the shade the hedge creates. I would therefore only install a root barrier where the vegetable garden borders. For the lawn, it certainly doesn't matter.