The answer to 'why is my grass brown patches' is that there are several common causes, including drought stress, disease, insect damage, or poor soil conditions. Brown patches in the lawn can be a sign of an underlying problem that needs to be addressed.
Drought stress is one of the most common causes of brown patches. When grass doesn't receive enough water, either from lack of rainfall or improper irrigation, it can go dormant and turn brown. This is usually a temporary condition and the grass will green up again once it receives more moisture.
Fungal diseases like brown patch, dollar spot, or rust can also lead to brown, dead areas in the lawn. These diseases thrive in certain environmental conditions and can spread quickly. Insect pests like grubs or chinch bugs feeding on the grass roots can also cause brown patches to appear.
Poor soil conditions, such as compaction, low fertility, or improper pH, can weaken the grass and make it more susceptible to problems. In these cases, addressing the underlying soil issues may be necessary to restore a healthy, green lawn.