Garden trellises are used for a range of applications. The primary purpose of a trellis is to support climbing plants and vines. However, you can also use a trellis without plants as a decorative accent piece in your garden. Depending on the design, some trellises even come with a multiple-use design. For instance, you can use a fence trellis to support plants and serve as an actual fence. On the other hand, a pergola fitted with a thick enough choice of plants can double as a garden or patio shade.