Japanese walnut

  • Japanese walnut_img_0
    Japanese walnut @ Yufuin
  • Japanese walnut_img_1
    Japanese walnut @ Yufuin
  • Japanese walnut_img_2
    Japanese walnut @ My home
  • Japanese walnut_img_3
    Japanese walnut @ Tokyo Metropolitan Jindai Botanical Park
  • Japanese walnut_img_4
    Japanese walnut @ Yufuin

Basic information

Flower Name
Japanese walnut
Formal Name
Juglans mandshurica var. sachalinensis
Japanese walnut
deciduous tree


What is Japanese walnut

Japanese walnut, scientific name: Juglans mandshurica var. Sachalinensis, is native to Japan, and it is a deciduous tree of "Walnutof in the Juglandaceae family. The shell is hard and it can be not taken out the fruit (core of kernel) without using a tool like a walnut splitter. Speaking of walnuts in Japan, it is this. The application is wood called "Walnut", which is considered to be "nuts of the world" and "the world's top three best wood" along with mahogany and teak. Walnut is woody and is used for high-end furniture, firearms and crafts. The main production areas of nuts are California and China, but Nagano Prefecture is famous in Japan.

Common name: Japanese walnut or Onigumi , Scientific name: Juglans mandshurica var. Sachalinensis, aka: walnut , Place of Origin: Japan, Habitat: Hokkaido to Kyushu, Environment: Along the river in the mountainous area, Producing location: Nagano Prefecture in Japan, California (US) and China abroad, Living type: Deciduous tree, Tree height: 7 to 20 m, bark: dark gray, with cracks longitudinally, leaf shape: odd binary leaves, phylogeny: alternation, leaf length: 50 cm, petiole: with, leaf edge: fine serrated, female and female, flowering stage: May to June, Petal: No, Male inflorescence length: 20 cm, Female inflorescence length: 10 cm, Female navy blue: Red, location of female flower: 10 spikelets at the tip of a branch, How to bloom male flower: Tufted, hanging , Fruit type: Nut, Fruit diameter: 3 cm, Fruiting stage: September to October, Application: Seeds are nuts Trees of fine wood walnut, shell is kneaded into the rubber of studless tire, nutrients: lipids, vitamin E, minerals, Remarks: need a nutcracker device to crack the hard shell to take out the seeds, anemophily.

Detailed information

J.mandshurica subsp. sieboldiana
Flower type
Actinomorphic Flower
Flower array
Spike Inflorescence
Petal shape
no petal
Leaf type
Imparipinnate-Compound Leaf
Leaf edge
Flowering place
Low mountain
700 ~ 2000 [cm]
0 ~ 0

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