I have a recently-erected six-foot high garden fence consisting of plastic posts and panels, not dissimilar to this:
Alongside this fence I'd like to build a raised bed, some thirty inches high. The front face could be attractive walling and the infill rubble and stones topped with earth. I'm reluctant to use the fence itself as a rear wall (and would it, in any case, resist the outward pressure of the infill?) but it seems somewhat over the top to build, say, a block wall right up against it. I've wondered about a rear wall of some suitable coated or protected sheet material (OSB maybe?) braced to the front wall, but I'd welcome any other suggestions.
Many thanks.