The answer to 'hedge bare spots' is that there are several common causes, including lack of sunlight, poor soil conditions, disease, or pest infestations. Symptoms may include thinning foliage, stunted growth, or dead patches within the hedge. Solutions can involve improving soil health, trimming or thinning the hedge, or treating any underlying issues.
In many cases, minor bare spots can be addressed with DIY methods like overseeding, fertilizing, or spot-treating pests. However, if the problem is widespread or the cause is unclear, it's best to consult a professional landscaper who can properly diagnose and treat the issue.