In history, urban planners have been of two minds about planting trees in the cities. In Egypt, Persia and India trees were arranged in neat lines to accommodate irrigation systems. In France trees were woven together to make high hedges, their crowns trimmed flat.
歷史上都市的設計師在種植樹時有兩種不同的心情，在埃及、波斯、印度，為了配合灌溉系統，將樹木處理成整齊的樹列；法國更將樹木編成高大樹籬，或處理成截頭樹。