Pleached allee

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Not everyone has room for a pleached allee, at least not on the scale that it is done in restored Williamsburg. Usually best results are obtained when trees are trained on a metal or wood framework. Trees suitable for this purpose are Beech, Hornbeam, Buttonwood, and fruits such as Peach, Pear, or Apple. They can be grown to single or double cordons or they may be fan-trained. 
Pleached allee Inside a pleached allee

The dimensions should be in accordance with the scale of the property. I would suggest that for the average-sized place 8 feet high by 7 feet wide would be the minimum, and it should be appropriately placed in a position where it will be useful. For example, it can connect the house and the garage or the dwelling with a garden feature such as a piece of statuary, a seat, or whatever it is you have. Whenever possible it should be oriented to run north and south so that the plants on each side have an equal chance.

The plants should be set 2 or 3 feet apart and cut almost to the ground. The strong shoots that will be stimulated by the pruning should be tied to the framework, spacing them as equally as possible. Subsequent pruning will be directed toward filling any vacant places on the framework by cutting back to a shoot or bud that is pointing in the right direction, and then cutting off superfluous shoots. When the shoots on both sides mingle they may be pleached, or plashed (woven together), so that eventually they may become grafted one to another. The support may be removed, if desired, as soon as this stage is reached.

To most gardeners the making of a pleached allee or arbor is of purely academic interest, so that is all I am going to say about it here.