Blue is the rarest color for poinsettias (Euphorbia pulcherrima).
Specifically, red, pink and white and marbled or mosaic combinations of those color as red and white or pink and white on each bract (modified leaf) are the most common. White is the color when carotenoid pigments take over the developmental process previously dominated by the green color-producing chlorophylls. Pink requires the efforts of carotenoids and anthocyanins. Red, purple and blue reflect the dominance of anthocyanins. But blue is the rarest outcome of that anthocyanin dominance.
rarest eye color is GREEN
blue
red
The rarest color for an Aurora Borealis is purple and orange in the aurora australis
Red is rarest-around 25 percent
Yellow is said to be the most popular, black in the middle and the rarest color would be chocolate.
The rarest color is bright apple green with flashes of the red, gold and orange fire.
black
PURPIL is the VERY RAREST colour of grossman aliens
rarest eye color is GREEN
Purple
Rainbow :)