<p>As the Rhododendron is to acid so is the Viburnum to limestone soils. They are a very varied and interesting genus of shrubs, a mixture of all the varieties listed here will give colour and interest the whole year. They will grow quite happily in full sun or part shade in well drained soil. The deciduous typed should be trimmed after they have flowered, just enough to remove any old wood. The evergreen types should have the same treatment but in May</p>