Tunnel farming is growing of different crops in a Greenhouse structure with walls and roof made chiefly of transparent material, such as plastic or netting ,in which plants requiring regulated climatic conditions are grown inside. These structures range in size from small sheds to industrial-sized buildings. The interior of a greenhouse exposed to sunlight becomes significantly warmer than the external temperature, protecting its contents in cold weather.
Many commercial Greenhouses Tunnels or hothouses are high tech production facilities for vegetables, flowers or fruits . The Vegetable Tunnels are filled with equipment including heating, cooling, lighting, and may be controlled by a computer to optimize conditions for plant growth