The structure of a thing is how the parts of it relate to each other. In gardens, the term can be applied to soil structure or planting design structure, but it is most often used for structures made out of hard materials including: timber, brick, concrete, metal, plastic, glass, etc. The category of garden structures therefore includes: garden buildings garden pond garden railway garden trellis gazebo greenhouse green wall grotto shell grotto decking fencing folly moon bridge moon gate patio pergola picnic table shade house shed stone wall terrace water feature zig-zag bridge See also Garden design Garden features