Which factor is most critical for the establishment of a healthy lawn?

The factor most critical for the establishment of a healthy lawn is soil preparation. Proper soil preparation lays the foundation for a successful lawn by ensuring that the soil has optimal conditions for grass seeds or sod to germinate and establish robust root systems. This process involves testing the soil pH and nutrient levels, amending the soil as needed, and ensuring good drainage and aeration.

Adequate soil preparation includes removing debris, tilling the soil to improve its texture, and incorporating organic matter to enhance fertility and moisture retention. These steps create an environment that supports healthy seed germination and root growth, which is essential for a vibrant lawn.

While other factors like regular mowing, fertilization, and a watering schedule are important for maintaining a lawn's health over time, they are not as crucial as the foundational step of proper soil preparation. Without a suitable soil environment, the success of grass growth is significantly diminished regardless of the quality of fertilization or watering practices.