Cloches are removable glass or plastic covers that protect plants from cold. Sometimes called bells or bell jars, most fit over individual plants, but some are large enough to cover a row. Like other covers, cloches should be placed over plants before the sun goes down and removed in the morning after the frost has thawed.
Glass cloches are highly ornamental. When you're not using them outside for frost protection, you can use them indoors over humidity-loving houseplants like violets. You can also use plastic cloches, which are generally less expensive than glass ones. But because they are lightweight, they must be staked into the ground to prevent them from blowing away in high winds.
Note: Since cloches used for cold protection are temporary measures, you may opt to create your own makeshift versions. Flower pots, Mason jars, baskets, and milk jugs with the bottoms removed can all be placed over plants to shield them from freeze and frost.
