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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.
Cork is composed of dead cells that accumulate on the outer surface of the cork oak tree. Harvests occur at nine-year intervals, when the cork layer reaches a thickness of 1-2 in 12-5 cm). The harvest from a young tree yields about 35 lb (16 kg) of cork, while the yield for an older tree may be 500 lb (225 kg).