Editing Greenhouse (section)

=== 15th-century Korea ===
The next biggest breakthrough in greenhouse design came from Korea in the 15th century during the [[Joseon]] dynasty. In the 1450s, Soon ui Jeon described the first artificially heated greenhouse in his manuscript called ''Sangayorok''.<ref name=":2" /> Soon ui Jeon was a physician to the royal family, and ''Sangayorok'' was intended to provide the nobility with important agricultural and housekeeping knowledge.<ref name=":2" /> Within the section of agricultural techniques, Soon ui Jeon wrote how to build a greenhouse that was able to cultivate vegetables and other plants in the winter.<ref name=":2" /> The Korean design adds an ''[[ondol]]'' system to the structure.<ref name=":2" /> An ''ondol'' is a Korean heating system used in domestic spaces, which runs a flue pipe from a heat source underneath the flooring.<ref name=":2" /> In addition to the ''ondol'', a cauldron filled with water was also heated to create steam and increase the temperature and humidity in the greenhouse.<ref name=":2" /> These Korean greenhouses were the first active greenhouses that controlled temperature, rather than only relying on energy from the sun.<ref name=":0" /> The design still included passive heating methods, such as semi-transparent oiled ''[[Korean paper|hanji]]'' windows to capture light and [[Cob (material)|cob]] walls to retain heat, but the furnace provided extra control over the artificial environment.<ref name=":2" /> The [[Annals of the Joseon Dynasty]] confirm that greenhouse-like structures incorporating ''ondol'' were constructed to provide heat for [[mandarin orange]] trees during the winter of 1438.<ref name=":2">{{cite journal |last1=Yoon |first1=Sang Jun |last2=Woudstra |first2=Jan |title=Advanced Horticultural Techniques in Korea: The Earliest Documented Greenhouses |journal=Garden History |date=Summer 2007 |volume=35 |issue=1 |pages=68–84 |jstor=25472355}}</ref>