In the example below, the orange blooms of the witch hazel (Hamamelis x 'Jelena') are much more visible when backed by the evergreen shrub (Pittosporum tobira 'Tall and Tough') than when backed by the open sky, where the blooms would have a tendency to disappear.
Another group of shrubs that would benefit from this treatment is the winter hazel (Corylopsis), Corylopsis pauciflora, pictured on the left.
Actually any delicately-blooming, deciduous shrub could likely use the extra help. Other examples that come to mind include dawn viburnum (Viburnum bodnantense 'Pink Dawn'), Stachyurus praecox, and Edgeworthia chrysantha.
