Which of the following is not a primary color?

The primary colors in the context of art and design are red, blue, and yellow. These colors are considered primary because they cannot be created by mixing other colors; instead, they serve as the basis for creating a wide range of other colors.

Green, on the other hand, is not a primary color; it is a secondary color formed by mixing two primary colors, specifically blue and yellow. Therefore, the understanding of primary and secondary colors is crucial for color theory in floral design and other artistic fields.