Orchards consist of many more items aside from just fruit trees. In fact, in asking orchardists around the world the simple question of "what is an orchard?", we have found that the orchards are defined just as much by the trees within it as the border or hedge that surrounds it. With out a clear demarcation of this kind to define the land as an orchard, the collection of trees inside are often just considered to be a group or trees, not an orchard.
Hedges and other types of borders serve to define the land and its boundaries, create a physical barrier for certain animals, either keeping them in or keeping them out, and as a windbreak to provide protection for the trees. However, the hedge or border can be so much more, and really integrates the components of the orchard. A border can be a pond or a stream, providing irrigation for the orchard. Hedges are diverse living fences, and are made up of several species and can be a mixture of moss, lichens, bushes, wildflowers, shrubs, and trees. Some of the fruit trees in a hedge can contribute to better fruit set with the cultivated species of apples, pears, etc being grown in the orchard.
These living fences, in their diverse nature, provide homes for a plethora of wildlife. Bees can nest within the hedge, hedgehogs, raccoons and other mammals liveout much of their existence in the hedges of orchards. Birds build nests or perch upon branches in hedges. The various species of a hedge can provide overwinter homes for various strains of yeast and other microorganisms. These inturn spread throughout the orchard in the Spring and Summer, and come to rest on the fruit which is then taken into the cider house where the cider is made. Without the yeast, there would be no cider or wine, just unfermented juice. None of those we asked included yeast or any microorganisms in their definition of what is an orchard, but you just might say that without yeast there could be no such place.