Blue Japanese Beech

Scientific name: Fagus japonica

Overview

Blue Japanese Beech is a deciduous beech native to central and southern Japan. Known locally as Inubuna or Kurobuna, it is distinct from the better-known Buna, Fagus crenata. It often has several stems and occurs in temperate forests, commonly at lower elevations than Japanese Beech. Botanical references emphasize its pale, slightly bluish leaf undersides and long fruit stalks. The word Blue in the common name should not be interpreted as a claim that its timber is blue.

Quick Facts

  • Common Name: Blue Japanese Beech
  • Scientific Name: Fagus japonica
  • Family: Fagaceae
  • Region: Asian Woods
  • Other Names: Inubuna; Kurobuna; Japanese Blue Beech
  • Native Range: Central and southern Japan, including Honshu, Shikoku, and Kyushu
  • Tree Size: Up to about 25 m (82 ft); often multi-stemmed
  • Average Dried Weight: A reliable species-specific air-dry value was not verified
  • Janka Hardness: A reliable species-specific measured value was not verified
  • Color: A reliable species-specific timber color range was not verified; the common name does not describe blue wood
  • Grain: Inspect individual stock; no consistent species-specific description is supplied
  • Texture: A species-specific timber texture description was not verified

Identification Characteristics

Blue Japanese Beech is best separated from Japanese Beech using botanical material and provenance. Long, slender fruit stalks and cupules that cover only the lower portion of the nuts are useful characters. The leaf undersides are pale or glaucous, and the bark is darker than the smooth pale bark commonly associated with Buna. Timber alone should not be assigned this name from its color.

Key identification traits include:

  • Pale or slightly bluish-green leaf undersides
  • Long, slender fruit stalks
  • Small cupules with nuts protruding beyond them
  • Dark brown bark with visible lenticels
  • A documented Japanese collection and botanical identification

Working Properties

Japan’s Tsukuba Botanical Garden describes uses of the wood as broadly similar to those of Buna, while noting a traditional distinction in timber quality. This is not a basis for assigning Fagus crenata test values to Fagus japonica. Detailed species-specific machining and drying data were not verified, so evaluate each documented piece before selecting a process.

  • Machining: Trial the actual stock with sharp tools
  • Drying: Check moisture condition, checks, and movement before assembly
  • Gluing: Test the adhesive on clean representative offcuts
  • Fastening: Predrill where needed and check edges for splitting
  • Finishing: Prepare a sample to assess appearance and finish compatibility

Safety Note

Use extraction and suitable eye and respiratory protection during cutting and sanding. Avoid unnecessary inhalation of dust and prolonged skin contact. Remove fine dust from the work area regularly.

Common Uses

Japanese botanical references describe wood use as broadly comparable with Japanese Beech. Precise performance and suitability depend on the individual material, and this species should remain separately identified.

  • General wooden articles and implements
  • Interior woodworking where the stock is suitable
  • Documented wood reference specimens
  • Botanical and educational collections

Sustainability & Notes

Kew accepts Fagus japonica as native to central and southern Japan. It contributes to temperate forest diversity and should be distinguished from Fagus crenata on sourcing records. Retain the collection or harvest locality and supplier documentation. No species-specific conservation category is asserted in this profile.

Comparative Notes & Related Species

Related Guides

Compare Wood Properties

See how this species ranks in density and hardness using our Wood Density & Janka Hardness Chart. You can also explore Hardest Woods, Softest Woods, and Most Dense Woods for quick comparisons.

Collector Notes

Record Fagus japonica and the Japanese name Inubuna when it accompanied the specimen. Keep any associated leaf, fruit, or tree photograph because those features aid identification. Preserve a clean end-grain face and an unfinished area, and document the original locality. Do not relabel ordinary Japanese Beech as Blue Japanese Beech solely from a trade name or color resemblance.

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Wood Sample Collection

This species is part of an ongoing effort to document and preserve wood samples from around the world.

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Resources

Authoritative botanical and forestry references used in compiling information about this species include:

• USDA Forest Service – Wood Handbook: Wood as an Engineering Material
https://www.fpl.fs.usda.gov/products/publications/

• The Wood Database – Global reference for wood identification, physical properties, and woodworking characteristics
https://www.wood-database.com/

• Royal Botanic Gardens, Kew – Plants of the World Online – Botanical taxonomy and species distribution database
https://powo.science.kew.org/

• International Union for Conservation of Nature (IUCN Red List) – Global conservation status assessments
https://www.iucnredlist.org/

• Convention on International Trade in Endangered Species (CITES) – International trade regulations for protected plant species
https://cites.org/

Additional forestry publications, academic research papers, and regional timber studies may also be referenced where available.

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Availability & Where to Buy

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As this archive grows, recommended suppliers and specialty wood retailers will be listed here to help woodworkers locate responsibly sourced material.

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