Greenhouses

right|thumb|Victoria amazonica (giant Amazon waterlilies) in a large greenhouse at the [[Saint Petersburg Botanical Garden]] A greenhouse is a structure that is designed to regulate the temperature and humidity of the environment inside. There are different types of greenhouses, but they all have large areas covered with transparent materials that let sunlight pass and block it as heat. The most common materials used in modern greenhouses for walls and roofs are rigid plastic made of polycarbonate, plastic film made of polyethylene, or glass panes. When the inside of a greenhouse is exposed to

urban park in Singapore

botanical garden in Bangalore, India

Oldest botanical garden in Saint Petersburg, Russia

type of greenhouse

right|thumb|250px|Polytunnels on Balhungie Farm, Angus, Scotland|Angus A polytunnel (also known as a polyhouse, hoop greenhouse, or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. Temperature, humidity, and ventilation ca

portable greenhouse

heated greenhouses in the park of the Royal Castle of Laeken i

greenhouse technology for arid regions

greenhouse in Schönbrunn Palace Park in Vienna, Austria

botanic garden in Meise, Belgium

Gardens in Lisbon, established in 1933

Palm house in the Burggarten of Vienna

thumb|Phytotron at Estonian University of Life Sciences

greenhouse for the public display of plants

thumb|A walipini in Utah thumb|The interior of a walipini A walipini is an earth-sheltered cold frame. It derives its name from the Aymaran languages. It is similar in concept to the pineapple pit that was used, as the name implies, to cultivate pineapple and other exotic fruits in Victorian era Britain and in the cold plains of pre-revolution Russia.

garden in Zurich (Switzerland)

type of greenhouse