The answer to 'how to maintain mulch' is to regularly replenish and refresh the mulch layer around your plants and trees. Spread 2-4 inches of fresh mulch around the base of plants, keeping it a few inches away from the stems and trunks. This helps retain moisture, suppress weeds, and insulate plant roots from temperature extremes.
Maintain the mulch layer by raking and fluffing it every few months to prevent compaction. Add more mulch as needed to maintain the recommended depth. Also, be sure to remove any weeds or debris that may have grown through the mulch. With proper maintenance, mulch can enhance the appearance and health of your landscaping.