A trellis and an arbor are both structures that can be used in a garden or landscape design, but they serve different purposes and have distinct characteristics. A trellis is typically a flat, latticed structure that is used to support and display climbing plants and vines. It can be freestanding or attached to a wall, and is often used to create a partition or to add a decorative element in a garden.
On the other hand, an arbor is a vertical structure that usually forms a tunnel or an archway in a garden. It is often used as a focal point or an entrance, and is designed to support climbing plants that create a 'roof' of foliage. Arbors can be made of various materials including wood, metal, or vinyl, and they often have a bench or a gate incorporated into their design.
In summary, while both trellis and arbor are used to support plants, a trellis is a flat structure that can be used to divide or decorate a space, whereas an arbor is a three-dimensional structure that creates a passageway or a sheltered area within a garden.