The answer to 'mulching not growing' is that there are several common causes for mulch not growing, including improper mulch application, poor soil conditions, and lack of moisture. Symptoms may include a thin, patchy mulch layer that doesn't break down over time.
To troubleshoot, start by checking the depth of the mulch - it should be 2-4 inches thick. Make sure the mulch is applied evenly and not piled up against plant stems or tree trunks. The soil pH and nutrient levels also play a role, so you may need to amend the soil. Lastly, ensure the mulch is getting adequate water, especially during dry spells.