The answer to 'shrub brown patches' is that there are several common causes, including drought stress, pest infestations, disease, or improper watering or fertilization. Symptoms may include discolored, wilting, or dying leaves and branches. Solutions can include adjusting watering and fertilization, treating pests or disease, or even replacing the affected shrubs.
It's important to diagnose the root cause before taking action. For minor issues, homeowners may be able to resolve the problem themselves. But for more serious or persistent problems, it's best to consult a professional landscaper or arborist who can properly identify and treat the issue.