HOW DOES A GREENHOUSE WORK
HOW DOES A GREENHOUSE WORK The greenhouse , also known as the glass house, is a building designed to protect against tender or off-season plants against extreme cold or heat. In the past, greenhouses were modest bricks or wooden shelters with little source of light and some sources of heat. As glass became cheaper and more refined forms of heating became available, the greenhouse was transformed into a ceiling-and-walled structure made of minimal wood or metal skeletons. By the middle of the nineteenth century, the greenhouse had evolved from a mere shelter to a hostile environment, tailored to the needs of particular plants. The large-scale increase in the availability of exotic plants in the 19th century resulted in a large increase in the culture of glasshouses in England and elsewhere. Large greenhouses are important for agriculture and horticulture and botanical sciences, while small structures are commonly used by hobbyists, collectors and domestic gardeners