A garden trellis is a structure used to support plants, either by tying the plants to the trellis or by allowing climbing plants to bind themselves to the structure. A trellis can be made of horizontal, vertical, or diagonal bars, usually spaced and arranged to form a decorative structure. The materials can be wood (either hardwood

Hardwood

Hardwood is wood from angiosperm trees . It may also be used for those trees themselves: these are usually broad-leaved; in temperate and boreal latitudes they are mostly deciduous, but in tropics and subtropics mostly evergreen.Hardwood contrasts with softwood...

 or treated softwood

Softwood

The term softwood is used to describe wood from trees that are known as gymnosperms.Conifers are an example. It may also be used to describe trees, which tend to be evergreen, notable exceptions being bald cypress and the larches....

), metal (e.g. galvanized iron), or plastic.