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Pleaching or plashing was common in gardens from the late Middle Ages until the 18th century. This technique is a kind of weaving of the branches of deciduous trees or shrubs to form a living fence. Sometimes branches woven together grow together, a natural grafting known as inosculation. Sir Walter Scott brought the technique back to popularity in England when he described such a fence in The Fortunes of Nigel.

Here's a "grow-your-own fence" - the pollarded willows not only supply the withes, they're also the fence posts at Appeltern Gardens -- BelleWood-Gardens - Diary

Large Gardens, compartmentalised, become more user friendly when not eaten in one mouthful. Wollerton Old Hall garden