Plants absorb, diffract and reflect sound. The balance varies with the frequency at which the sound is generated and the room’s physical properties. The type of plant, its size, shape, the container, top dressings and the compost, all have an effect on the sound reduction capabilities of plant displays.
Plant parts such as stems, leaves, branches and wood all absorb sound. Rough bark and thick, fleshy leaves are particularly effective at absorbing sound with their dynamic surface area. The greater number of plants, the size of the plant and its surface area will all affect its ability to absorb sound. Plants alter room acoustics by reducing the reverberation time.