Viburnum is a dense, compact shrub with pointed green leaves edged with creamy yellow. It has clusters of red flowers in late winter and spring. Though most cultivars are deciduous, there are many varieties that are evergreen or semi-evergreen, like Prague viburnum. Gardeners in zones with milder winters find the most success. Shrubs are some of the garden’s most versatile plants, acting as a background to other displays and adding structure, emphasis and variation in height, plus colour all-year round with flowers, berries and bark. Think of them as the permanent framework around which other plants are interwoven.