At the most basic level, it is structural. Thanks to its flexibility, great tensile strength, ease of handling and durability (when cared for) timber has an essential role to play in the safe creation of many garden structures (and most of the buildings we still live in). In this role it supports decking, stairways, roofs and floors, holds up gateposts and prevents doorways from collapsing.
Beyond this however is the great and inescapable fact of its natural good looks - even beauty - and this quality has been exploited for centuries to embellish the man-made environment, both indoors and out. Whether shaped or left in its native state, wood brings something of the primitive to the garden. As our first building material and the fuel for our earliest fires wood has claim to be as deeply rooted in the human subconscious as the tree is in the earth. Living and dead it has been of critical importance to our survival, sheltering and warming our species since its infancy. In the form of the living tree it continues to be a source of spiritual solace, although paradoxically the forest has also the capacity to inspire fear - the sinister beings of fairytale lurk there.