The answer to 'why is my hedge erosion' is that hedge erosion is typically caused by a combination of environmental factors, such as heavy rains, wind, and poor soil conditions. Symptoms of hedge erosion include exposed roots, uneven growth, and gaps in the hedge. To address hedge erosion, you may need to re-plant sections of the hedge, improve soil quality, and ensure proper drainage around the hedge.
In some cases, hedge erosion may be a sign of a more serious issue, such as pest infestations or disease. If the erosion is severe or you're unsure of the cause, it's best to consult with a professional landscaper who can assess the problem and provide tailored solutions.