Large Polytunnels

All Large Polytunnels are based on the same simple yet effective design. A polytunnel consists of a strong metal frame which forms a semi-circular tunnel. This sturdy frame is then covered using a heavy gauge, hard wearing polythene. The light passing through the polythene is diffused, so preventing plants from shading one another in the polytunnel, so all receive the same, even amount of light for even growth throughout the tunnel.
The main advantage of a polytunnel compared to a greenhouse is cost - a polytunnel will provide you with lots of space and light at a fraction of the cost of a glass glazed greenhouse - for the same price of a small greenhouse you'll be able to get a polytunnel 4-5 times larger, so you'll have more protected space to work under and raise crops. This makes polytunnels an affordable solution for raising crops out of season and for growing crops which like a warm, protected growing space - such as cucumbers, peppers, tomatoes etc.