Although the terms often are used interchangeably, trellises, arbors and pergolas are distinctly different structures. A trellis is typically a latticework built to support climbing plants or vines. It can be a simple panel attached to the side of a building, or it can be freestanding in a garden or yard.
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An arbor usually incorporates a trellis into its structure, creating a tunnel-like passageway of climbing plants. Arbor's have a continuous run of latticework from one side of the "tunnel" to the other, often in an arched shape.
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Pergolas, too, are designed to support climbing plants. Unlike arbors, though, pergolas simply have posts supporting a rooflike structure. They're most commonly used to shade a walkway or deck.
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