A pergola is a structure over a covered walk for the purpose of supporting flowering, usually woody, plants which would grow on trees and shrubs in their natural habitat. The word pergola derives from the Latin pergula, meaning a projecting roof. Pergolas were very popular in nineteenth century England and became a frequent accompaniement of the Arts and Crafts Style of garden design.
See also: history of planting design.
Pergola planting design, by T H Mawson