Pollarding is a technique whereby the growth of a tree or shrub is restricted or reduced to below its natural size. It’s usually first performed when the plant is reaching its desired height. Pollarding is then carried out annually to maintain the size long-term. It is often used: In built-up areas to prevent them from encroaching on nearby structures/utilities. To keep trees in their allotted area as part of routine grounds maintenance. To reduce shade and help improve the growth of surrounding plants.