A polytunnel (also known as a tunnel greenhouse, hoop greenhouse or hoophouse, or high tunnel) is a tunnel made of polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun passes through the polyethylene material, which is designed to trap heat while allowing light to penetrate—creating a microclimate that is warmer and more stable than the external environment. This heat retention is crucial for extending growing seasons, protecting plants from frost, extreme temperatures, and harsh weather conditions such as heavy rain or strong winds. The structure typically features a frame, often made of metal or PVC pipes, that supports the polyethylene covering, ensuring durability and resistance to environmental stress. Polytunnels are widely used in agriculture, horticulture, and home gardening, accommodating a variety of crops from vegetables and herbs to flowers, by regulating temperature, humidity, and light exposure.
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