The answer to 'tree trimming turning brown' is that there are several common causes, including improper trimming, disease, pests, or environmental stress. Symptoms may include leaves turning brown and dying, branches becoming brittle, or the tree failing to thrive. Solutions can range from proper trimming techniques to treating diseases or pests, or addressing environmental factors like drought or soil issues.
If the browning is limited to a few branches, it may be possible to address the problem through careful DIY trimming. However, if the issue is more widespread or the cause is unclear, it's best to consult a professional arborist or landscaper. They can diagnose the problem and recommend the appropriate treatment to restore the health of the tree.