The answer to 'grass not growing' is that there are several common causes, including poor soil quality, lack of sunlight, improper watering, and pest or disease issues. Symptoms may include thin, patchy grass, discoloration, and slow growth. Solutions can range from improving soil conditions, adjusting watering and mowing practices, to treating for pests or diseases.
In many cases, minor grass growing issues can be addressed through DIY measures like aeration, overseeding, and applying the right fertilizers. However, if the problem persists or you're unsure of the cause, it's best to consult a professional landscaper who can properly diagnose and treat the issue.