"I'm going to try one of those tiered greenhouse shelf thingies, and hope it's stable enough in strong winds."
Probably worth anchoring it as firmly as you can manage...
Exactly what I was going to say. If it's one of those things that are basically a set of shelves with a poly cover it should be possible to attach some adjustable guy-lines and tighten them when Weather threatens. Run a line from each of the top corners, and maybe an additional one from halfway down for Real Weather. It might look a little eccentric to other people, but you'll be the one smiling when you eat your own produce.
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Exactly what I was going to say. If it's one of those things that are basically a set of shelves with a poly cover it should be possible to attach some adjustable guy-lines and tighten them when Weather threatens.
Run a line from each of the top corners, and maybe an additional one from halfway down for Real Weather. It might look a little eccentric to other people, but you'll be the one smiling when you eat your own produce.