Easy living fence ideas

Hi, I’m working with a warm-summer Mediterranean (Csb) climate, USDA zone 9b, with hot dry summers and mild wet winters. We get around 1,200 mm of rainfall annually, mostly concentrated in winter. I’m aiming for a low-maintenance, resilient living fence!

Here’s one idea, blackberries grow wild here, I could just set poles with a trelis and just let the thorny blackberries go crazy! I could grow it at least 2 meters high, and 2 or 3 meters width.

In my imagination it’s basically a fence made of nature’s barbed wire and it will get me awesome blackberries to eat as a bonus, and I believe the maintainance to be minimal, it looks like a win win win situation…

However, my experience is minimal, and my ignorance soars through the skies! Hence, me being here, hoping to drink from your experiences and knowledge.

Is this a good idea, why/why not?

Any other ideas are more than welcome.

Thank you so much in advance for the input and help!