Seed pods of broom shrub disperse seeds via evaporative tension buildup and release.

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“Broom powers its explosions in exactly the opposite manner. Its launching energy comes not from an increase of liquid but from its evaporation. As a pod warms on a summer’s day, the side facing the sun dries faster than that in the shade. This sets up a tension in the pod which finally causes it to split suddenly into its two halves, catapulting its tiny black seeds in all directions as it does so.” (Attenborough 1995:16)

The Private Life of PlantsAugust 21, 1995
David Attenborough

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