The answer to 'mulching turning brown' is that there are a few common causes for mulch turning brown, including too much sun exposure, lack of moisture, and decomposition over time. Symptoms include the mulch losing its vibrant color and taking on a dull, brown appearance.
To address this issue, you can try lightly raking the mulch to fluff it up and expose the fresher, lighter-colored layers underneath. Applying a new 2-3 inch layer of fresh mulch can also help revive the appearance. If the problem persists, it may be time to consider replacing the mulch entirely. For larger areas or if you're unsure of the cause, it's best to consult a professional landscaper who can assess the situation and provide the right solution.