The answer to 'why is my grass brown patches' is that brown patches in the lawn are often caused by a variety of factors, including drought, disease, pests, or improper lawn care. Brown patches can indicate an underlying issue that needs to be addressed.
Common causes of brown patches include lack of water, fungal diseases like brown patch or dollar spot, grub damage from insects, or nutrient deficiencies in the soil. Symptoms include discolored, wilted, or dead grass in circular or irregular patterns. To fix brown patches, you may need to adjust your watering, treat for pests or disease, or improve soil health through aeration and fertilization. In some cases, you may need to reseed or resod the affected areas.