/kloc-in the 0/8th century, glass greenhouses appeared in Britain and Holland. In 1950s and 1960s, the development and production of greenhouses in the United States and Canada reached its peak. The industrialized production of greenhouse in Europe, Holland and Germany has risen. In 1960s, the United States successfully developed soilless culture technology, which made great changes in greenhouse culture technology. By the early 1970s, the United States had used 400hm2 soilless greenhouse to produce cucumbers and tomatoes. 1980, the global greenhouse area for vegetable production reached165,000 hm2, with an annual output value of $30 billion. The greenhouse used for flower production is 55,000 hm2, with an annual output value of $654.38+0.6 billion. During this period, the number of greenhouses in Asia and the Mediterranean increased rapidly. Greenhouse in southern Europe mainly produces vegetables, while greenhouse in northern Europe mainly produces flowers and high value-added ornamental plants.
The production greenhouse area of large facilities in developed countries is above 0.5hm2. Since 1994, many large greenhouses have been built in the southern United States, each with an area of more than 20hm2. The family size of greenhouses in Holland and Belgium is generally about 2hm2, and the single building area of each greenhouse is above 0.5hm2. The development direction of greenhouses proposed by Japan is that the single building area is above 0.5hm2. Multi-span greenhouses have been widely promoted, which has expanded the space of greenhouses, allowing for three-dimensional cultivation and facilitating mechanized operation.