The term "plant material" refers to any part or component of a plant, including leaves, stems, roots, flowers, fruits and seeds. It can also refer to organic matter derived from plants such as hay, wood chips, or sawdust. In the context of agriculture, it may mean crop residues like stalks, husks or peels left in the field after harvesting. Additionally, plant material could be used for medicinal purposes, where herbs and other natural substances are utilized to promote health and well-being.