The answer to 'mulching not growing' is that there are several common causes, including improper application, poor soil quality, or lack of moisture. Symptoms may include slow plant growth, dull color, and weed growth in the mulch.
To fix this, first check that the mulch was applied at the proper depth (2-4 inches) and covering the soil evenly. Poor soil may need to be amended with compost or other organic matter. Ensure the mulch is kept moist, especially during dry spells. If the issues persist, it's best to consult a professional landscaper who can assess the specific problems and recommend the right solutions.