Theory
As with many things, the theory behind laying a hedge is easy. The practice is much harder - requiring skill and experience. The aim is to reduce the thickness of the upright stems of the hedgerow trees by cutting away the wood on one side of the stem and in line with the course of the hedge. This being done, each remaining stem is then laid down towards the horizontal, along the length of the hedge.
A stem which has been (or is to be) laid down in this manner is known as a "pleacher". A section of bark and some sapwood must be left connecting a pleacher to its roots in order to keep the pleacher alive - knowing how much is one part of the art of hedgelaying. It is also essential that pleachers are not laid down completely horizontal as some upward slant is required to ensure the sap will still rise properly through the plant - judging and achieving the required degree of upward slant is again a matter of skill.
Smaller shoots branching off the pleachers and upright stems too small to be used as pleachers are known as "brash" or "brush" and in most styles of laying the brash will be partly removed and partly woven between the pleachers to add cohesiveness to the finished hedge.
At regular intervals upright stakes are placed along the line of the hedge. These stakes give the finished hedge its final strength. When they wanted to get fancy they would pleach the uprights with such things as hazel whips woven around the tops of the stakes. The woven whips are known as "binders" or "heatherings" and can also be of birch, ash, willow etc. In fact, these can be of any green wood which will hold the stakes and tops of the pleachers down securely.
Read more about this topic: Hedge Laying
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—Susan Sontag (b. 1933)
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—Jean Baudrillard (b. 1929)