However, before ever beginning to espalier a plant, consider the time, effort and expense associated with the hobby, Goodspeed warns. Espaliered plants require a trellis or some other type of support, extra training and pruning and considerable foresight into the end product. He says espaliered plants need to be placed with the proper sun exposure in mind. If a plant is going to be trained against a wall, be sure it will receive sufficient light. A north or east facing wall may be suitable for shade loving plants, but will restrict the growth of most trees.
Walls also radiate heat back to the plant.
This can cause some sunburning, but may also decrease the time required for fruit production. Whether on a wall or fence, Goodspeed says the plants need some type of support to help them maintain their shape. This is especially important when the plants are young. Remember that most plants are stubborn, and it takes a good strong wire or fence to get them to conform to the desired shape. This helps establish the framework.