The answer to 'why is my sprinkler system brown patches' is that there are several common causes, including improper sprinkler coverage, drought stress, disease, or pest infestations. Brown patches in your lawn can indicate that certain areas are not getting enough water from your sprinkler system, leading to dry, discolored grass.
Some key symptoms to look for include uneven or patchy grass coverage, wilting or curling leaves, and a noticeable difference in grass color and texture between problem areas and healthy lawn. The solution often involves adjusting your sprinkler heads, fixing any leaks or blockages in the system, and potentially overseeding or re-sodding affected areas.