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To do that, they have more of the inconspicuous but pollen- and nectar-rich fertile flowers and just enough of the showier, sterile ray florets to act as a billboard for insects.

The petals you actually see on a daisy flower are those from the ray florets.

With just days to go, Gupta got to work making 320 flowers, each less than an inch in diameter, with individual white ray florets hand-cut and glued to each center disc.

Each of the large yellow petals in the sunflower’s familiar fringe is in fact a flower all its own—sterile ray florets that have evolved to look like the petals of one giant flower.

These have been derived from D. coccinea; they have a disk of tubular florets surrounded by the large showy ray florets.