Any garden can benefit from some sort of structure.
One of my favorite structural elements is trelliswork. I've used trellises to relieve the monotony of flat surfaces, to add a sense of enclosure, and to screen or frame a view. A trellis can also place fragrant or showy blossoms at nose or eye level. Walls, ceilings, and arbors made of latticework create dappled shade that's pleasing to both people and shade-loving plants. Above all, trelliswork can enhance a garden by serving as an ornamental element.