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A roof garden is a
garden A garden is a planned space, usually outdoors, set aside for the cultivation, display, and enjoyment of plants and other forms of nature. The single feature identifying even the wildest wild garden is ''control''. The garden can incorporate both ...
on the
roof A roof ( : roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temper ...
of a building. Besides the decorative benefit, roof plantings may provide food, temperature control, hydrological benefits, architectural enhancement, habitats or corridors for wildlife, recreational opportunities, and in large scale it may even have ecological benefits. The practice of cultivating food on the rooftop of buildings is sometimes referred to as
rooftop farming Urban agriculture, urban farming, or urban gardening is the practice of cultivating, processing, and distributing food in or around urban areas. It encompasses a complex and diverse mix of food production activities, including fisheries and for ...
. Rooftop farming is usually done using
green roof A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage ...
,
hydroponics Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents. Terrestrial or aquatic plan ...
,
aeroponics Aeroponics is the process of growing plants in the air or mist environment without soil or an aggregate medium. The word "aeroponic" is derived from the Greek meanings of ''aer'' ("air") and ''ponos'' ("labour"). It is a subset of hydroponic ...
or air-dynaponics systems or
container garden Container gardening or pot gardening/farming is the practice of growing plants, including edible plants, exclusively in containers instead of planting them in the ground. A container in gardening is a small, enclosed and usually portable object ...
s.


History

Humans have grown
plants Plants are predominantly Photosynthesis, photosynthetic eukaryotes of the Kingdom (biology), kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all curr ...
atop structures since the
ziggurats A ziggurat (; Cuneiform: 𒅆𒂍𒉪, Akkadian: ', D-stem of ' 'to protrude, to build high', cognate with other Semitic languages like Hebrew ''zaqar'' (זָקַר) 'protrude') is a type of massive structure built in ancient Mesopotamia. It has ...
of ancient
Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the F ...
(4th millennium BC–600 BC) had plantings of trees and shrubs on aboveground terraces. An example in
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a letter ...
times was the
Villa of the Mysteries The Villa of the Mysteries ( it, Villa dei Misteri) is a well-preserved suburban ancient Roman villa on the outskirts of Pompeii, southern Italy. It is famous for the series of exquisite frescos in Room 5, which are usually interpreted as showin ...
in
Pompeii Pompeii (, ) was an ancient city located in what is now the ''comune'' of Pompei near Naples in the Campania region of Italy. Pompeii, along with Herculaneum and many villas in the surrounding area (e.g. at Boscoreale, Stabiae), was buried ...
, which had an elevated terrace where plants were grown. A roof garden has also been discovered around an audience hall in Roman-Byzantine
Caesarea Caesarea () ( he, קֵיסָרְיָה, ), ''Keysariya'' or ''Qesarya'', often simplified to Keisarya, and Qaysaria, is an affluent town in north-central Israel, which inherits its name and much of its territory from the ancient city of Caesare ...
. The medieval Egyptian city of
Fustat Fusṭāṭ ( ar, الفُسطاط ''al-Fusṭāṭ''), also Al-Fusṭāṭ and Fosṭāṭ, was the first capital of Egypt under Muslim rule, and the historical centre of modern Cairo. It was built adjacent to what is now known as Old Cairo by ...
had a number of high-rise buildings that
Nasir Khusraw Abu Mo’in Hamid ad-Din Nasir ibn Khusraw al-Qubadiani or Nāsir Khusraw Qubādiyānī Balkhi ( fa, ناصر خسرو قبادیانی, Nasir Khusraw Qubadiani) also spelled as ''Nasir Khusrow'' and ''Naser Khosrow'' (1004 – after 1070 CE) w ...
in the early 11th century described as rising up to 14 stories, with roof gardens on the top story complete with ox-drawn
water wheel A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel (usually constructed from wood or metal), with a number of blades or buckets ...
s for irrigating them. Among the
Seven Wonders of the Ancient World The Seven Wonders of the Ancient World, also known as the Seven Wonders of the World or simply the Seven Wonders, is a list of seven notable structures present during classical antiquity. The first known list of seven wonders dates back to the 2 ...
, The
Hanging Gardens of Babylon The Hanging Gardens of Babylon were one of the Seven Wonders of the Ancient World listed by Hellenic culture. They were described as a remarkable feat of engineering with an ascending series of tiered gardens containing a wide variety of tre ...
are often depicted as tall structures holding vegetation; even immense trees. In
New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...
between 1880 and
Prohibition Prohibition is the act or practice of forbidding something by law; more particularly the term refers to the banning of the manufacture, storage (whether in barrels or in bottles), transportation, sale, possession, and consumption of alcoholic ...
large rooftop gardens built included the
Hotel Astor (New York City) Hotel Astor was a hotel on Times Square in the Midtown Manhattan neighborhood of New York City. Built in 1905 and expanded in 1909–1910 for the Astor family, the hotel occupied a site bounded by Broadway (Manhattan), Broadway, Shubert Alley, ...
, the American Theater on Eighth Avenue, the garden atop
Stanford White Stanford White (November 9, 1853 – June 25, 1906) was an American architect. He was also a partner in the architectural firm McKim, Mead & White, one of the most significant Beaux-Arts firms. He designed many houses for the rich, in additio ...
's 1890
Madison Square Garden Madison Square Garden, colloquially known as The Garden or by its initials MSG, is a multi-purpose indoor arena in New York City. It is located in Midtown Manhattan between Seventh and Eighth avenues from 31st to 33rd Street, above Pennsylva ...
, and the Paradise Roof Garden opened by
Oscar Hammerstein I Oscar Hammerstein I (8 May 18461 August 1919) was a German-born businessman, theater impresario, and composer in New York City. His passion for opera led him to open several opera houses, and he rekindled opera's popularity in America. He was ...
in 1900. Commercial greenhouses on rooftops have existed at least since 1969, when Terrestris rooftop nursery opened on 60th st. in New York City. In the 2010s, large commercial
hydroponic Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents. Terrestrial or aquatic plan ...
rooftop farms were started by
Gotham Greens Gotham Greens is an American fresh food and urban agricultural company founded and headquartered in the Brooklyn borough of New York City that grows local produce year-round in greenhouses, with its lettuces, herbs, salad dressings and sauces sold ...
,
Lufa Farms Lufa Farms is an Urban agriculture, urban agricultural company located in the Saint-Laurent, Quebec, Ville Saint-Laurent neighbourhood of Montreal, Montreal, Quebec. The company states its mission on its website is to grow food where people live ...
, and others.


Environmental impact

Roof gardens are most often found in
urban environment An urban area, built-up area or urban agglomeration is a human settlement with a high population density and infrastructure of built environment. Urban areas are created through urbanization and are categorized by urban morphology as cities, t ...
s. Plants have the ability to reduce the overall heat absorption of the building which then reduces energy consumption for cooling. "The primary cause of heat build-up in cities is
insolation Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m ...
, the absorption of solar radiation by roads and buildings in the city and the storage of this heat in the building material and its subsequent re-radiation. Plant surfaces however, as a result of transpiration, do not rise more than above the ambient and are sometimes cooler." This then translates into a cooling of the environment between , depending on the area on earth (in hotter areas, the environmental temperature will cool more). The study was performed by the University of Cardiff. A study at the
National Research Council of Canada The National Research Council Canada (NRC; french: Conseil national de recherches Canada) is the primary national agency of the Government of Canada dedicated to science and technology research & development. It is the largest federal research ...
showed the differences between roofs with gardens and roofs without gardens against temperature. The study shows temperature effects on different layers of each roof at different times of the day. Roof gardens are obviously very beneficial in reducing the effects of temperature against roofs without gardens. “If widely adopted, rooftop gardens could reduce the
urban heat island An urban heat island (UHI) is an urban or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. The temperature difference is usually larger at night than during the day, and is most apparen ...
, which would decrease smog episodes, problems associated with heat stress and further lower energy consumption.” File:Temperature_profiles.JPG File:Rain_runoff.JPG Aside from rooftop gardens providing resistance to thermal radiation, rooftop gardens are also beneficial in reducing rain run off. A roof garden can delay run off; reduce the rate and volume of run off. “As cities grow, permeable substrates are replaced by impervious structures such as buildings and paved roads. Storm water run-off and combined sewage overflow events are now major problems for many cities in North America. A key solution is to reduce peak flow by delaying (e.g., control flow drain on roofs) or retaining run-off (e.g., rain detention basins). Rooftop gardens can delay peak flow and retain the run-off for later use by the plants.”


Urban agriculture

“In an accessible rooftop garden, space becomes available for localized small-scale urban agriculture, a source of local food production. An urban garden can supplement the diets of the community it feeds with fresh produce and provide a tangible tie to food production.” At
Trent University Trent University is a public liberal arts university in Peterborough, Ontario, with a satellite campus in Oshawa, which serves the Regional Municipality of Durham. Trent is known for its Oxbridge college system and small class sizes.
, there is currently a working rooftop garden which provides food to the student café and local citizens. Available gardening areas in cities are often seriously lacking, which is likely the key impetus for many roof gardens. The garden may be on the roof of an
autonomous building An autonomous building is a building designed to be operated independently from infrastructural support services such as the electric power grid, gas grid, municipal water systems, sewage treatment systems, storm drains, communication services, ...
which takes care of its own water and waste.
Hydroponics Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents. Terrestrial or aquatic plan ...
and other alternative methods can expand the possibilities of roof top gardening by reducing, for example, the need for soil or its tremendous weight. Plantings in containers are used extensively in roof top gardens. Planting in containers prevents added stress to the roof's waterproofing. One high-profile example of a building with a roof garden is Chicago City Hall. For those who live in small apartments with little space,
square foot gardening Square foot gardening is the practice of dividing the growing area into small square sections, typically on a side, hence the name. The aim is to assist the planning and creating of a small but intensively planted vegetable garden. It results ...
, or (when even less space is available) green walls (vertical gardening) can be a solution. These use much less space than traditional gardening. These also encourage environmentally responsible practices, eliminating tilling, reducing or eliminating pesticides, and weeding, and encouraging the recycling of wastes through composting.


Importance to urban planning

Becoming green is a high priority for urban planners. The environmental and aesthetic benefits to cities are the prime motivation. It was calculated that the temperature in
Tokyo Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, with an estimated 37.468 ...
could be lowered by if 50% of all available rooftop space were planted with greenery. This would lead to savings of approximately 100 million yen.
Singapore Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, borde ...
is active in green urban development. "Roof gardens present possibilities for carrying the notions of nature and open space further in tall building development." When surveyed, 80% of Singapore residents voted for more roof gardens to be implemented in the city's plans. Recreational reasons, such as leisure and relaxation, beautifying the environment, and greenery and nature, received the most votes. Planting roof gardens on the tops of buildings is a way to make cities more efficient. A roof garden can be distinguished from a
green roof A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage ...
, although the two terms are often used interchangeably. The term roof garden is well suited to roof spaces that incorporate recreation, and entertaining and provide additional outdoor living space for the building's residents. It may include planters, plants, dining and lounging furniture, outdoor structures such as pergolas and sheds, and automated irrigation and lighting systems. Although they may provide aesthetic and recreational benefits a green roof is not necessarily designed for this purpose. A green roof may not provide any recreational space and be constructed with an emphasis on improving the insulation or improving the overall energy efficiency and reducing the cooling and heating costs within a building. Green roofs may be extensive or intensive. The terms are used to describe the type of planting required. The panels that comprise a green roof are generally no more than a few centimeters up to 30 cm (a few inches up to a foot) in depth, since weight is an important factor when covering an entire roof surface. The plants that go into a green roof are usually
sedum ''Sedum'' is a large genus of flowering plants in the family Crassulaceae, members of which are commonly known as stonecrops. The genus has been described as containing up to 600 species, subsequently reduced to 400–500. They are leaf succulen ...
or other shallow-rooted plants that will tolerate the hot, dry, windy conditions that prevail in most rooftop gardens. With a green roof, "the plants' layer can shield off as much as 87% of solar radiation while a bare roof receives 100% direct exposure". The planters on a roof garden may be designed for a variety of functions and vary greatly in depth to satisfy aesthetic and recreational purposes. These planters can hold a range of ornamental plants: anything from trees, shrubs, vines, or an assortment of flowers. As aesthetics and recreation are the priority they may not provide the environmental and energy benefits of a green roof.


In popular culture

* American jazz singer
Al Jarreau Alwin Lopez Jarreau (March 12, 1940 – February 12, 2017) was an American singer and musician. His 1981 album '' Breakin' Away'' spent two years on the ''Billboard'' 200 and is considered one of the finest examples of the Los Angeles pop and R ...
composed a song named "Roof Garden", released on his 1981 album. *
Apu Nahasapeemapetilon Apu Nahasapeemapetilon is a recurring character in the American animated television series ''The Simpsons''. He is an Indian immigrant proprietor who runs the Kwik-E-Mart, a popular convenience store in Springfield, and is known for his catchphra ...
of the TV show ''
The Simpsons ''The Simpsons'' is an American animated sitcom created by Matt Groening for the Fox Broadcasting Company. The series is a satirical depiction of American life, epitomized by the Simpson family, which consists of Homer, Marge, Bart, Lisa, ...
'' has a roof top garden visited by Paul McCartney and his wife. * In
BBC #REDIRECT BBC #REDIRECT BBC Here i going to introduce about the best teacher of my life b BALAJI sir. He is the precious gift that I got befor 2yrs . How has helped and thought all the concept and made my success in the 10th board exam. ...
...
's 1990 television miniseries ''
House of Cards A house of cards (also known as a card tower or card castle) is a structure created by stacking playing cards on top of each other, often in the shape of a pyramid. "House of cards" is also an expression that dates back to 1645 meaning a structu ...
'', the main character,
Member of Parliament A member of parliament (MP) is the representative in parliament of the people who live in their electoral district. In many countries with bicameral parliaments, this term refers only to members of the lower house since upper house members of ...
(MP)
Francis Urquhart Francis Ewan Urquhart is a fictional character created by British politician and author Michael Dobbs. Urquhart is the main character in Dobbs's ''House of Cards'' trilogy of novels and television series: ''House of Cards'' (1990), ''To Play t ...
, murders journalist
Mattie Storin This article is about characters in the ''House of Cards'' trilogy other than Francis Urquhart. The trilogy consists of three separate four part serials, '' House of Cards'', '' To Play the King'' and '' The Final Cut'', all based on identica ...
by throwing her off the
Palace of Westminster The Palace of Westminster serves as the meeting place for both the House of Commons of the United Kingdom, House of Commons and the House of Lords, the two houses of the Parliament of the United Kingdom. Informally known as the Houses of Parli ...
's rooftop garden.


Gallery

File:Villa Arson jardin terasses2011.jpg, Villa Arson File:Villa Arson jardin terrasses 2011-3.jpg, Villa Arson File:Acrosfukuoka02.jpg, ACROS Fukuoka File:Herb garden of National Museum of Nature and Science Tokyo 01.jpg, Herb garden of National Museum of Nature and Science Tokyo File:Zen little roof garden.jpg, A small
Zen Zen ( zh, t=禪, p=Chán; ja, text= 禅, translit=zen; ko, text=선, translit=Seon; vi, text=Thiền) is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School (''Chánzong'' 禪宗), and ...
roof garden File:Sveavägen 44, takterass -03.JPG, ''
Sedum ''Sedum'' is a large genus of flowering plants in the family Crassulaceae, members of which are commonly known as stonecrops. The genus has been described as containing up to 600 species, subsequently reduced to 400–500. They are leaf succulen ...
'' roof at Urban Deli, Stockholm File:Inari Daimyojin on the roof of Hankyu Department Stores Umeda main store.JPG, Inari Daimyojin on the roof of Hankyu Department Stores Umeda main store File:Tokyuplaza-3.JPG, Tokyo Plaza File:Canalcityhakatainner.jpg,
Canal City Hakata is a large shopping and entertainment complex in Fukuoka, Fukuoka, Fukuoka, Japan. Called the "city within the city," it boasts numerous attractions including shops; cafes; restaurants; a theater; game center; cinemas; two hotels; and a canal, wh ...


See also

*
Agrivoltaic Agrivoltaics, agrophotovoltaics, agrisolar, or dual-use solar is the simultaneous use of areas of land for both solar photovoltaic power generation and agriculture. The coexistence of solar panels and crops implies a sharing of light between the ...
*
Building-integrated agriculture Building-integrated agriculture (BIA) is the practice of locating high-performance hydroponic greenhouse farming systems on and in mixed-use buildings to exploit synergies between the built environment and agriculture. Typical characteristics of B ...
*
Cool roof Reflective surfaces or ground-based albedo modification (GBAM) is a solar radiation management method of enhancing the Earth's albedo (the ability to reflect the visible, infrared and ultraviolet wavelengths of the sun, reducing heat transfer to ...
*
Kensington Roof Gardens Kensington Roof Gardens (formerly known as Derry and Toms Roof Gardens and later The Roof Gardens) is a private roof garden covering on top of the former Derry & Toms building on Kensington High Street in central London. Originally opened in ...
*
List of garden types A wide range of garden types exist. Below is a list of examples. By country of origin *Chinese garden ** Cantonese garden ** Sichuanese garden *Dutch garden * Egyptian garden *English garden **English landscape garden *French garde ...
*
Low-flow irrigation systems Micro-irrigation, also called Micro-spray,localized, low-volume, low-flow, or trickle irrigation, is an irrigation method with lower water pressure and flow than a traditional sprinkler system. Low-volume irrigation is used in agriculture for row ...
*
Metropolitan Museum of Art Roof Garden The Met Fifth Avenue is the primary museum building for the Metropolitan Museum of Art in New York City, United States. The building is located at 1000 Fifth Avenue, along the Museum Mile on the eastern edge of Central Park in Manhattan's Upper ...
* Ralph Hancock, designer of The Rockefeller Center Roof Gardens *
Roof deck In architecture, a deck is a flat surface capable of supporting weight, similar to a floor, but typically constructed outdoors, often elevated from the ground, and usually connected to a building. The term is a generalization from the deck ...
*
Terrace garden In gardening, a terrace is an element where a raised flat paved or gravelled section overlooks a prospect. A raised terrace keeps a house dry and provides a transition between the hardscape and the softscape. History ;Persia Since a level si ...
*
Wildlife corridor A wildlife corridor, habitat corridor, or green corridor is an area of habitat connecting wildlife populations separated by human activities or structures (such as roads, development, or logging). This allows an exchange of individuals between ...


References


External links


''The New York Times'' article about rooftop garden in Manhattan
{{Authority control Types of garden Architectural elements Urban agriculture Roofs Sustainable building