The garden cloche is a glass or plastic covering, placed over plants to protect them from harsh weather, usually frosts. The word comes from the french for bell, since they used to be bell-shaped. Originally, they were made of glass, and placed individually over the plants. You can also get opaque ones for forcing plants such as rhubarb.
Cloches can cost a lot, especially in relation to the value of the plants they are protecting. I once saw some excellent cloches, made from terracotta, designed for forcing rhubarb. Lovely they were, but at about 55 quid each, I figured you can buy a awful lot of rhubarb for that.
My Dad used to make cloches from rectangles of salvaged glass that were placed to form a triangular tent over the plants, lines of them used to cover planted rows of seeds or seedlings. I don't happen to have any suitable glass, but I can get transparent corrugated plastic fairly cheaply. A sheet 2.5 metre by 0.9m costs about 15 euros. I got two, here they are being a cloche. I need to get some flat transparent plastic to cover the ends; my wife has some suitable perspex that I can cut to size.
Just under 5 metres of cloche, 30 euros. Nay bad. Sturdy, and stores flat too, when not in use.
As an optional enhancement, I might try using the bendy green poles, suitably shortened, to hold them in place instead of the rustic-effect sticks.