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- The wood nearer the heart of a stem or branch, different in color from the sapwood
- A popular myth is that heartwood is stronger than sapwood.
- The staves are split from the heartwood. The heartwood is composed of dead cells; it supports the tree, but no longer has any physiological purpose. The staves must follow the grain of the wood to achieve a watertight cask, so they are split rather than sawn. — L'encyclopédie du Cognac: From log to stave