Sowing and harvesting of vegetables can be brought forward roughly one month by using garden poly-tunnels or cloches (plastic or glass soil covers) before and after the seed sowing process. They can also be used at the end of the season to protect some low growing crops and extend the growing season. Give them a try and you will wonder how you ever did without them.
Cloches are just smaller poly-tunnels which are normally used to protect a small number or individual plants.
Cloches are made from plastic or glass held together by a system of wire, plastic or wooden supports. Plastic cloches are the most practical because they do not break easily and are more liable to last for many years,