The answer to 'hedge overgrown' is that a hedge can become overgrown due to lack of regular trimming and maintenance. This can cause the hedge to become thick, unruly, and take up more space than intended. Symptoms of an overgrown hedge include it becoming difficult to maintain the desired shape and size, blocking views or pathways, and potentially causing damage to nearby structures.
The best solution is to regularly trim and maintain the hedge, usually 1-2 times per year depending on the type of hedge. This can often be done as a DIY project with the right tools like hedge trimmers. However, for very large or tall hedges, it may be best to call in a professional landscaper or arborist to ensure the job is done safely and properly.