The Manchurian Walnut (Juglans mandshurica) is a large, cold-hardy deciduous tree of the East Asian forests, distinguished by its exceptionally long compound leaves — among the longest of any walnut species — and its clusters of small, thick-shelled, intensely flavored nuts. Native to the rugged forests of Manchuria, Korea, and the Russian Far East, it is one of the most cold-tolerant walnuts and an important timber and nut tree in its native range.
• Reaches 20 to 30 meters tall with a broad, open crown
• Exceptionally long compound leaves, 40 to 80 cm, with 9 to 19 leaflets
• Produces clusters of small, thick-shelled, richly flavored nuts
• One of the most cold-hardy walnut species, surviving to -40 degrees Celsius
• Important timber tree in northeastern China and the Russian Far East
• Also called the Dragon Walnut for its deeply ridged, dragon-scale-like nut shells
분류학
• Found in northeastern China (Manchuria), the Korean Peninsula, and the Russian Far East (Primorsky Krai, Amur Oblast)
• Grows in mixed deciduous forests alongside Mongolian oak, Amur cork tree, and Manchurian ash
• Found at elevations from 100 to 1,500 meters
• Adapted to the harsh continental climate of the Manchurian region, with extremely cold winters and warm summers
• The species name "mandshurica" refers to Manchuria, the region of northeastern China
• Known in Chinese as "hu tao qiu" (walnut autumn)
• In Russian, called "manchzhurskiy orekh" (Manchurian nut)
• An important component of the Manchurian mixed forest ecoregion, one of the most biodiverse temperate forest ecosystems in the world
• Long cultivated in northeastern China for nuts and timber
Bark:
• Gray to dark gray, developing deep longitudinal fissures with age
• Similar in texture to Black Walnut bark
Leaves:
• Alternate, pinnately compound, 40 to 80 cm long — exceptionally long even for a walnut
• 9 to 19 leaflets, each lanceolate, 8 to 18 cm long, finely serrated
• Dark green above, paler and slightly hairy beneath
• Aromatic when crushed
• Turn golden-yellow in autumn
Flowers:
• Monoecious — male and female flowers on the same tree
• Male flowers in pendulous catkins, 8 to 15 cm long
• Female flowers in small terminal clusters of 5 to 10
• Wind-pollinated in late spring
Fruit:
• Nuts borne in clusters of 5 to 10 — unusual for walnuts, which typically produce 1 to 3
• Nuts small (2 to 4 cm), elongated, with extremely thick, deeply ridged shells
• Shell ridges resemble dragon scales — hence the common name Dragon Walnut
• Kernel is small, richly flavored, and high in oil
• Green husk is thin and slightly sticky
Form:
• 20 to 30 meters tall with trunk diameter 50 to 100 cm
• Crown broad, open, somewhat irregular
• Long compound leaves create a tropical appearance despite the cold-hardy nature
Habitat:
• Found in mixed deciduous forests of the Manchurian region
• Prefers deep, moist, fertile, well-drained soils in valley bottoms and on lower slopes
• Adapted to extreme cold — among the most cold-hardy of all Juglans species
• Grows in a region with winter temperatures reaching -40 degrees Celsius
Ecological interactions:
• Nuts are an important food for squirrels, wild boar, bears, and various birds
• Part of the rich biodiversity of the Manchurian mixed forest ecoregion
• Supports numerous insect species adapted to Juglans foliage
• Produces juglone, which influences the composition of the understory plant community
Growth:
• Moderate growth rate of 30 to 50 cm per year
• Long-lived, surviving 100 to 200+ years
• Develops a deep taproot
• Sprouts from the base when damaged
Site selection:
• Full sun
• Deep, fertile, well-drained soils
• Very cold-hardy — suitable for climates too harsh for most other walnuts
• Allow ample space for the large mature crown
Planting:
• Plant seedlings or grafted trees in spring
• Deep taproot makes transplanting difficult — use small, container-grown plants
Care:
• Water during the first few growing seasons
• Drought-tolerant once established
• Minimal pruning needed
• Generally pest-resistant in cultivation
• Hardy to USDA zones 3 to 7 (survives -40 degrees Celsius)
Timber:
• Wood is similar to Black Walnut — rich, dark, beautifully grained
• Used for fine furniture, cabinetry, gunstocks, and decorative veneer in China and Russia
• An important commercial timber species in northeastern China
• Wood is highly valued and increasingly scarce in native forests
Edible nuts:
• Small but intensely flavored kernels, high in oil and protein
• Used in Chinese cooking and traditional confections
• Nut oil used as a gourmet cooking oil
• Commercially harvested in northeastern China
Ornamental:
• Striking long compound leaves give a tropical effect
• Golden-yellow fall color
• Suitable for large landscapes in cold climates
Traditional medicine:
• Bark and green husks used in traditional Chinese medicine
• Used for digestive complaints, skin conditions, and as an anti-inflammatory
• Juglone extracted for its antifungal and antiparasitic properties
재미있는 사실
The Manchurian Walnut produces some of the most extraordinary nut shells in the walnut family — deeply and dramatically ridged in a pattern that resembles the scales of a mythical dragon, earning it the alternative name "Dragon Walnut." Despite growing in one of the coldest forest regions on Earth (winter temperatures regularly drop below -40 degrees Celsius), its enormous compound leaves can reach 80 cm long, giving the tree an almost tropical appearance during the brief but intense Manchurian summer.
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