Apergola is most commonly used as an outdoorgarden feature forming a shaded walkway, passageway, or sitting area of vertical posts or pillars that usually support crossbeams and a sturdy openlattice, often upon whichwoodyvines aretrained.[1] The origin of the word is theLate Latinpergula, referring to a projecting eave.
It also may be an extension of a building or serve as protection for an openterrace or a link betweenpavilions. They are different fromgreen tunnels, with a green tunnel being a type of road under a canopy of trees.
Depending on the context, the terms "pergola", "bower", and "arbor" are often used interchangeably. An "arbor" is also regarded as being a wooden bench seat with a roof, usually enclosed by lattice panels forming a framework for climbing plants.Methodists andBaptists holdbrush arbor revivals under such structures.[2] A pergola, on the other hand, is a much larger and more open structure. Normally, a pergola does not include integral seating.
Modern pergola structures can also include architectural or engineering structures having a pergola design, which are not used in gardens.California High-Speed Rail, for instance, uses large concrete pergolas to support high-speed railguideways which cut over roadways or other rail tracks at shallow angles (unlike bridges or overcrossings which are usually nearly at right angles). (See the high-speed rail pergola structure picture elsewhere in the article for an illustration.)
Pergolas may link pavilions or extend from a building's door to an open garden feature such as an isolated terrace or pool. Freestanding pergolas, those not attached to a home or other structure, provide a sitting area that allows for breeze and light sun, but offer protection from the harsh glare of direct sunlight.
Pergolas also give climbing plants a structure on which to grow.[3]
In 1498,Leonardo da Vinci decorated theSala delle Asse of theCastello Sforzesco in Milan to give the illusion of the great square and vaulted reception hall being within a pergola that was made up of the intertwined branches of sixteen huge mulberry trees.[4] The novel project was commissioned by the Duke of Milan,Ludovico Sforza.
Pergolas are more permanent architectural features than thegreen tunnels oflate medieval and earlyRenaissance gardens that often were formed of springywithies—easily replacedshoots ofwillow orhazel—bound together at the heads to form a series ofarches, then loosely woven with long slats on which climbers were grown, to make a passage that was both cool, shaded, and moderately dry in a shower.
At theMedici villa,La Petraia, inner and outer curving segments of such green walks, the forerunners of pergolas, give structure to the pattern that can be viewed from the long terrace above it.
The origin of the word is theLate Latinpergula, referring to a projectingeave.[5] TheEnglish term was borrowed fromItalian. The term was mentioned in an Italian context in 1645 byJohn Evelyn at thecloister ofTrinità dei Monti inRome[6] He used the term in an English context in 1654 when, in the company of thefifth Earl of Pembroke, Evelyn watched thecoursing of hares from a "pergola" built on thedowns nearSalisbury for that purpose.[7]
The clearly artificial nature of the pergola made it fall from favor in the naturalistic gardening styles of the eighteenth and nineteenth centuries. Yet handsome pergolas on brick and stone pillars with powerful cross-beams were a feature of the gardens designed in the late nineteenth and early twentieth centuries by SirEdwin Lutyens andGertrude Jekyll and epitomize their trademark of firm structure luxuriantly planted. A particularly extensive pergola is featured at the gardens of The Hill inHampstead (London), designed byThomas Mawson for his clientW. H. Lever.Pergola in Wrocław was designed in 1911 and became aUNESCO World Heritage Site in 2006.[8]
Modern pergola design materials including wood, vinyl, fiberglass, aluminum, andchlorinated polyvinyl chloride (CPVC) rather than brick or stone pillars, are more affordable and are increasing in popularity. Wooden pergolas are made either from a weather-resistant wood, such as western red cedar (Thuja plicata) or, formerly, of coast redwood (Sequoia sempervirens). They are painted,stained, or use wood treated with preservatives for outdoor use. For a low-maintenance alternative to wood, the contemporary materials of vinyl, fiberglass, aluminum, and CPVC can be used. These materials do not require yearly paint or stain like a wooden pergola would, and their manufacture can make them even stronger and longer-lasting than a wooden pergola. These contemporary material pergolas can also be motorized to open and close.
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