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Have you ever wondered where cork comes from? It comes from the bark of the Cork Oak tree (tree species name - Quercus suber). The cork bark of this species of oak tree (yes it does produce acorns) can grow to become two to three inches thick. Normally however it is harvested when it is about one or one and a half inches thick.
An incredibly versatile natural material, cork is harvested from living cork oak trees somewhat like wool is gathered from sheep. The trees are unharmed by the process, and they continue producing cork for an average of 150 years.