Trees, shrubs and hedges provide shelter and protection for wildlife, particularly nesting birds and hibernating insects. They provide food in the form of leaves, nectar-rich flowers, berries, fruits, seeds and nuts and are also good hunting grounds for predators seeking insects and other invertebrates.
They make natural wind breaks, creating sheltered areas in the garden (particularly important for insects such as butterflies) and they create areas of shade, which increase the range of habitats within the garden. If there is limited space in the garden, growing climbing plants up a bare wall or fence will create similar advantages to hedges and greatly increase the value of the boundary for wildlife.
The best time for planting is between November and March, but never plant into waterlogged or frozen ground. Bare rooted plants are cheaper, but take care not to expose the roots for long when planting. Keep the base of plants free from weeds with a thick mulch or matting, until they are established.