A well maintained hedge can add privacy, shape and shade to a property. When trimming is left too long, the hedge can become wide, patchy and difficult to bring back under control. The right schedule depends on the plant variety, season, growing conditions and the finish you want. How often do hedges need trimming Fast growing hedges may need attention every six to twelve weeks during active growth. Slower varieties may only need a few visits each year. Formal hedges with str