A greenhouse is a building with walls and a roof made mainly of transparent or translucent material, like glass or plastic (usually polyethylene or polyvinyl), designed for the in-door cultivation of crops. The frame is usually built with wood or metal (usually aluminum or galvanized steel). Greenhouses are used for the production of vegetables, flowers and fruits. Growing vegetables and fruits in a greenhouse offers a good number of advantages, especially in Africa. The continent is still a net importer of food despite possessing 60% of the world's uncultivated arable land. Africa can significantly increase its food production with the greenhouse technology. Africa currently accounts for less than 5% of area dedicated to protected agriculture in the world, while China accounts for most of the area dedicated to the cultivation of vegetables in plastic greenhouses. Greenhouses are one of several forms of protected agriculture. The following are the advantages of using
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