Evening primrose flowers can sweeten their nectar within minutes of bee-like sounds.

Flower nectar feels like a slow chemical reward that sits there waiting for pollinators. Evening primrose makes the process feel more responsive. In experiments with Oenothera drummondii, flowers exposed to playback of bee wingbeat sounds increased nectar sugar concentration within minutes, while higher-frequency sounds and silence did not produce the same response. The safest wording is that the flower responds to airborne vibrations, not that it hears like an animal. Still, the effect is wonderfully direct: a flower can sense a likely pollinator nearby and quickly make the reward sweeter.

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