WHY does each flower have a different scent?

To attract the right insects.
Almost all fragrant flowers are pollinated by insects. Plants benefit from pollinators visiting one flower and flying to another one.

Then the flowers will get pollen of their own kind, not someone else’s. To this end, flowers have features that help insects recognize them: shape, coloration, and, of course, smell. It can include substances that are attractive to the “right” pollinators.

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