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.
enough to heat a garage.....this site tells you how to do it with soda cans ... heat a greenhouse or coop
Love the checkerboard pattern