Lavender Hidcote - This easy-to-grow sun perennial thrives in full sun normal garden soil. Plants vigorously grow to form mounds of fragrant, silvery foliage 18" tall 24" wide. This drought-tolerant hardy perennial has extremely fragrant foliage flowers
Add Windows If your space is small, create windows, as seen in this gate, and vary the height of your plants or structures. That will give the area some visual relief -- and give your yard a playful quality.
From BHG: A flagstone path leading down the slope offers a different character and textural contrasts.In place of a rail or a fence, mid-height shrubs fill the space to the narrow side of the path. Several hostas, which cascade over the stair-stepped path, soften the wood edge. Shrubs and steadfast perennials, such as daylilies, congregate at the crown of the hill.