Buckwheat hulls are the outer shells of the buckwheat grain, which is a plant related to rhubarb. These hulls are lightweight, hard, and have a natural shape that makes them useful for various applications. They are often used as a filling in pillows and cushions due to their ability to provide support while remaining breathable. In addition to bedding products, buckwheat hulls are also used in gardening as a natural mulch. They help retain moisture in the soil and can improve drainage. Furthermore, they are biodegradable, making them an eco-friendly option for both home and garden use.