What part of the tree is used to make cork?

Cork is harvested from the bark of the cork oak tree (Quercus suber). This outer layer of the tree is stripped away in a sustainable manner, allowing the tree to continue growing and producing cork for many years. The inner bark is composed of a material called cork, which is lightweight, buoyant, and has Excellent insulating properties. Harvesting typically occurs every nine to twelve years, ensuring the health of the tree.