Preventing weed growth on soil wall/slope

That's a possibility but I'm trying to get away from it since it starts to shed plastic bits over time. I'm also wondering about the slug aspect, but I guess I'll never completely avoid it. I've tried cardboard and old compost bags but it really needs something fixed there, not just haphazardly thrown on top.

Burn the edges of the membrane. Stops it shedding (as long as you don’t hit it with the strimmer after it’s down   )