The answer to 'shrub not growing' is that there are several common causes, including improper planting, insufficient sunlight or water, nutrient deficiencies, and pests or diseases. Symptoms may include stunted growth, yellowing or wilting leaves, and bare or sparse foliage.
To troubleshoot, first check the planting location and ensure the shrub is getting the right amount of sunlight and water. Test the soil and amend it with appropriate nutrients if needed. Look for signs of pests or diseases and treat accordingly. If the issue persists, it's best to consult a professional landscaper who can diagnose the problem and provide the right solution.