The answer to 'lawn fertilization not growing' is that there could be several common causes, including improper fertilizer application, soil pH issues, or underlying lawn health problems. Symptoms may include patchy growth, yellowing grass, or slow or stunted growth.
To troubleshoot, start by testing your soil to check the pH and nutrient levels. If the pH is outside the optimal range for your grass type, you may need to amend the soil. Also ensure you're applying the right type and amount of fertilizer at the proper times of year. If the issue persists, you may have a more serious problem like pest infestations or disease that requires professional diagnosis and treatment.