Abstract: An installation for the preparation of frozen vegetables, comprising from upstream in the downstream direction a device (10) for washing the fresh vegetables and a device (14) for the spin-drying of the washed vegetables; the freezing device (16) of the rapid individual type; at least one device (22) suitable for exerting on the frozen vegetables sufficient mechanical stresses to allow them to be broken into a plurality of fractions; at least one device (23) for sorting the frozen uniform fractions; a device (30) for packaging at least one of the frozen fractions; means for disposing of the fraction or fractions coming from the sorting device and intended not to be used; this installation being specially designed for the preparation of aromatic herbs or plants.