Cloches are most useful for early planting multiple-sown seedlings or early sowings. If your soil is heavy, start by incorporating well-rotted compost or peat into the top few inches. This will help to aerate the soil and warm it up. Later, it helps retain moisture. If you are using peat, rake in blood, fish and bone meal at about two handfuls per square metre.
Position the cloche over the ground to be used about a month before sowing and planting, which should start in late winter. Be sure to measure the soil temperature- which should be 7 degrees before planting anything. The soil under the cloche will dry out faster than the open the ground because the structure keeps the rain out, so make sure you water by hand when necessary. If you can, install a length of seep or perforated, hose along the length of cloche so you only have to fit the end to the garden hose and leave it to water itself.