heartwood
The older inner wood of a trunk, which mainly provides support and no longer conducts water.
Heartwood in a black walnut trunk cross-section (Juglans nigra)
All languages
- English
- heartwood
- Norwegian
- kjerneved
- Japanese
- 心材 — しんざい — shinzai
- Korean
- 심재 — simjae
- Spanish
- duramen
- French
- duramen
- German
- Kernholz
Illustrations are AI-generated and translations are undergoing language review.
Reference sources
- US Forest Products Laboratory Wood Handbook — heartwood is the darker non-conductive interior core surrounded by lighter sapwood
- USDA Forest Service technology-transfer sheet — black walnut sapwood is nearly white while its heartwood ranges to dark chocolate brown
- Penn State Extension — black walnut commonly has a large dark central heartwood zone surrounded by lighter sapwood