A garden arbour is a decorative structure, usually comprised of two trellis side walls, an arched top and sometimes a back wall. The front is left open, creating an entrance to a space where you can place seating to create a little nook. Otherwise, the archway can be used to frame garden pathways or act as an entranceway. The trellis walls and curved roof are perfect for hanging plants or encouraging climbers and vines to grow.