Thank you for the answers. I would prefer wood, also because it is probably the easiest to work with. But since I already have to paint 60m of wooden fence every 2 years, I am giving up on wood here. I will probably plaster and paint. Of course, there are experts you can pay to do that. But where is the fun in that for me? I want to do it myself. That's kind of like a hobby. Nevertheless, afterwards everything will be greened as much as possible. Plants make life more beautiful!