The answer to 'why is my lawn fertilization' is that there are several common causes for issues with lawn fertilization, including applying the wrong type or amount of fertilizer, improper timing, or underlying soil or environmental problems. Symptoms can include patchy, discolored, or unhealthy grass growth. The solutions depend on the specific issue but may involve adjusting the fertilizer type, application rate, or timing, or addressing underlying soil or environmental factors.
For most homeowners, lawn fertilization is a DIY task that can be done effectively with the right knowledge. However, if you're unsure of the cause of your lawn issues or need help developing a comprehensive lawn care plan, it's best to consult a professional landscaper or lawn care specialist.