The answer to 'shrub not growing' is that there can be several common causes, including poor soil conditions, improper planting, insufficient sunlight or water, or pest/disease issues. Symptoms may include stunted growth, yellowing or wilting leaves, and a general lack of vigor.
To troubleshoot, start by checking the soil - is it too compacted, too dry, or lacking in nutrients? Amend the soil as needed and ensure the shrub is getting the right amount of water. Make sure it's planted in a spot with the appropriate sunlight requirements. Inspect for signs of pests or disease and treat accordingly. If the issues persist, it's best to consult a professional landscaper who can assess the problem and recommend the best solution.