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In a word 'no', neither will a thick plastic membrane before you ask. What you need is a few bricks mortared together, otherwise known as a wall... If it is retaining the raised bed nobody will be able to see how shit (or good) your brickwork is. Brick is cheaper and better than sleepers, which also rot. A gap of 1cm to the decking is plenty.
ColinTheBald-
Do you think it's feasible to hang the joists from the retaining wall then? That was my other idea, although damp ingress into the joists could be an issue, DPM behind the hangers might be enough to solve that?Otherwise it's retaining wall and posts inside, which will be a big old foundation but probably ok. The deck boards will be composite so I don't think damp should be an issue for them.
Polygon
I'm going to need to retain some beds off the side of the deck I'm building at some point, the beds will be more or less level with the deck, so O need to maintain an air-gap so the frame doesn't rot.
Do we think these mesh panels, lined with weed membrane and spaced off the frame would be up to the job? I'm struggling to find examples of this done elsewhere, possible because it's a massive ballache.