Semms Property Services detects common hedge pests like aphids or diseases such as powdery mildew early. They use targeted treatments to prevent the diseases from affecting the overall health of the hedge. At Semms Property Services, gardeners recommend pruning in the dormant season—late winter or early spring. After pruning Southern Highlands, hedge trimming is another essential aspect of hedge management. It’s not just about keeping the hedge neat; it’s about maintaining its density and shape.