What is "cloches"

Usage examples of "cloches".

The garden was a model of orderliness, with rows of cauliflowers and winter cabbage, leeks and Brussels sprouts and, under cloches along one wall, neat rows of seedlings.

The patch of ground she was trying to clear must at some stage have produced summer salad vegetables, because as she dug she was unearthing the remains of what would have once been metal cloches and the soil was full of splintered pieces of glass.