Pollarding is the removal of all growth back to a set point on the main and secondary stems. Pollarding is a heavy form of pruning and although it has a place in the world of tree surgery, it is not something that we widely recommend.
However, once a tree has been pollarded, it is good practice to re-pollard at regular intervals throughout the life of the tree. If left unmanaged, trees that have been pollarded can often fail due to the increased regrowth from one point. A regular maintenance schedule should be put in place to prevent the chance of failure.
The diagram Above shows what the practice of pollarding looks like. The main crown of the tree has been removed to leave a framework. The tree will then have to be periodically re-pollarded.