The answer to 'garden turning brown' is that there are several common causes, including drought, disease, pests, and improper lawn care. Symptoms may include patches of discolored, wilting, or dying grass and plants. Solutions can range from adjusting watering schedules, applying fertilizer, treating for pests or disease, and aerating the soil.
If the issue is widespread or the cause is unclear, it's best to consult a professional landscaper or horticulturist. They can diagnose the problem and recommend the appropriate treatment. DIY solutions may work for minor, isolated issues, but a professional assessment is advised for more serious or persistent problems.