Pleached trees: training and maintenance

Pleaching is the technique of training trees to grow along a flat vertical plane -- creating a living screen or elevated hedge on clear trunks -- by tying branches to a framework and weaving (interweaving) lateral branches together over time. Per the Royal Horticultural Society, the result is a.

Pleaching is the technique of training trees to grow along a flat vertical plane — creating a living screen or elevated hedge on clear trunks — by tying branches to a framework and weaving lateral branches together over time. Per the Royal Horticultural Society, the result is a "hedge on stilts" — a formal horizontal canopy raised 5—8 feet above ground on clear trunks, used to screen neighboring buildings or views, define space, or create formal garden rooms without blocking ground-level light and air movement.

Pleaching is a European formal gardening technique with centuries of use in France and England. It requires a framework, regular training, and annual maintenance for the life of the screen.

How it works

A row of trees is planted on a regular spacing (typically 6—8 feet center-to-center). A permanent framework of horizontal wires or wooden rails is installed between the trunks at the desired canopy height. Lateral branches are trained, tied, and interwoven along this framework; stems perpendicular to the plane are removed. Over 5—10 years, the branches of adjacent trees meet and, where they touch, can be encouraged to inosculate (graft together naturally) or simply be tied and maintained in contact.

Per RHS guidance, annual maintenance involves:

• Removing all growth below the framework level (keeping trunks clear)
• Tying new lateral growth into the framework
• Clipping the canopy plane flat in summer (for tight formal effect) or allowing a looser growth pattern

The key discipline in the early years is consistency: missing one season's summer clip and tie-in allows vertical shoots to thicken and become woody before they can be redirected into the framework plane.