The answer to 'why is my lawn brown patches' is that brown patches on a lawn are usually caused by a combination of factors, including drought, disease, pests, or improper lawn care. Brown patches may be a sign of a larger issue that needs to be addressed.
Common causes of brown patches include drought stress, fungal diseases, grubs or other pests, compacted soil, or nutrient deficiencies. Symptoms can include discolored, thinning, or dead grass in circular or irregular patterns. Solutions may involve adjusting watering, applying fungicides or insecticides, aerating the soil, or overseeding the affected areas. If the problem persists, it's best to call in a professional landscaper to diagnose and treat the issue.