A greenhouse is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. These structures range in size from small sheds to industrial-sized buildings. A miniature greenhouse is known as a Cold frame.
The purpose of a greenhouse is to shield crops from excess cold or heat and unwanted pests. A greenhouse makes it possible to grow certain types of crops year-round, and fruits, tobacco plants, vegetables, and flowers are what a greenhouse most commonly grows.
