The answer to 'how to maintain mulching' is to regularly replenish and refresh the mulch in your landscaping. Mulch helps retain moisture in the soil, suppress weeds, and provide a neat, finished look to your garden beds and landscaping. To maintain mulch properly, you should aim to have a 2-4 inch layer of fresh mulch at all times.
Start by removing any old, decomposed mulch and weeds before applying new mulch. Then, spread a 2-4 inch layer of fresh mulch over the soil, being careful not to cover any plant stems or crowns. Replenish the mulch as needed, typically every 6-12 months, to maintain the desired depth. Be sure to keep mulch a few inches away from the base of plants and trees to prevent rot or disease.