Astilboides tabularis. It is the perfect plant for a shady area and does best in heavy, wet soil. It's also a good choice as a marginal plant next to a large pond. Astilboides does flower, sending up creamy white, Astilbe-like plumes in July, but the leaves are the plant's main attraction. It can take several years for a good-sized clump to form, but allow plenty of room for growth when planting, as a single plant can grow to 120cm (4ft) wide.
Creating two levels of hedging by underplanting the raised hedge is a nice twist on the stilted hedge that has become popular with garden designers in recent years. Here we see a formal low-clipped boxwood hedge under the raised hedge of Photinia x fraseri 'Red Robin'. Both are evergreen, creating great year-round interest.