Modern. If a modern landscape is what you strive for, think of the plant material as just another texture, material, or color to incorporate into your landscape. The linear swaths of green juxtaposed with the industrial concrete walls complete the perfect minimal garden.
More often in contemporary gardens, hardscaping can be the overriding design feature, as with these simple concrete retaining walls.The plantings are used to emphasize the clean lines of the walls. Grasses can be perfect to achieve this. The Festuca grasses used here become low-maintenance ground covers as they grow, requiring minimal irrigation or tending.
terraces with interesting plantings; much too formal, but tall stuff filling in the bottom right corner makes interesting. texture and color changes too
While this is rather plain hardscaping (simple concrete walls), the choice to fill the terraced wall with varying colors of grass creates tremendous visual appeal.