The answer to 'why is my lawn fertilization' is that there could be several common causes, including improper application, using the wrong type of fertilizer, or applying at the wrong time of year. Symptoms may include patchy growth, yellowing or discoloration, and poor overall lawn health. To troubleshoot, start by checking the fertilizer instructions and application schedule, and consider whether your lawn is receiving the right nutrients and care.
If the issue persists, it's best to consult a professional landscaper who can assess your lawn and recommend the appropriate fertilization plan. They can test the soil, identify any deficiencies, and provide a customized solution to get your lawn looking its best.