Which tree species produces cork harvested from its outer bark?

The cork oak produces cork harvested from its outer bark.

Scientifically known as Quercus suber, this evergreen oak is native to southwestern Europe and northwestern Africa. Its thick, spongy bark protects the living tissues inside the trunk from fire, drought, and some damage.

Cork can be removed from mature trees without cutting them down. After harvesting, the bark gradually regrows, and the tree can be stripped again after several years. Portugal and Spain are major producers of natural cork.

Cork is used for bottle stoppers, flooring, insulation, footwear, and other products. Cork oak is sometimes confused with other Mediterranean oaks, but its unusually thick, lightweight bark is the defining commercial feature. Sustainable harvesting depends on leaving the inner bark and growing tissues intact.