Seedrattling

Seedrattling is a term used to describe a phenomenon observed in certain plant species where the seeds within a dry fruit make a rattling sound when the fruit is shaken. This sound is typically produced by the seeds moving freely inside the dehiscent fruit capsule. The capsule usually dries and splits open, exposing the seeds and allowing them to be dispersed. The rattling sound is a direct result of the seeds' mobility within this enclosure.

This mechanism is a common adaptation for seed dispersal, particularly in plants that rely on wind or animal movement to spread their offspring. The rattling can alert potential dispersers, such as birds or small mammals, to the presence of the seeds, or it can simply be a byproduct of the mature, dry fruit structure. When the plant or its fruit is disturbed by wind, rain, or passing animals, the movement causes the seeds to collide with each other and the walls of the fruit, creating the characteristic rattling noise.

Examples of plants that exhibit seedrattling include various species of legumes, such as certain types of peas and beans, where the dried pods can produce a distinct rattle. Other examples can be found in the poppy family, where the dried seed capsules rattle when shaken. The intensity and clarity of the rattling sound can vary depending on the size, shape, and number of seeds, as well as the structure of the fruit. This audible signal serves as an indicator of seed maturity and readiness for dispersal.