The primary color of grass is green, which is due to the presence of chlorophyll, a pigment crucial for photosynthesis. This green pigment allows plants to absorb light, particularly in the blue and red wavelengths, while reflecting green light, which is why we perceive grass and many plants as green. Chlorophyll not only plays a vital role in converting sunlight into energy but also contributes to the overall health and vitality of the plant. The lush green color of grass is often associated with healthiness and growth, making it an important aspect of natural landscapes and ecosystems.