For centuries breeders have sought to make true blue flowers, yet there is no true blue pigment in plants.
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In nature, blue is much rarer than you might think. Sure, the sky is blue when the weather’s nice, and so is the ocean. But the vast majority of plants and animals are incapable of making blue pigment. Brilliantly-colored peacocks appear blue not because their feathers are colored that way, but because of how they reflect light. Less than 10 percent of the world’s 280,000 flowering plants produce blue flowers, which may be why they’re often a symbol of the unattainable in folklore and literature.