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Juglans mandschurica - Maxim.

Common Name Manchurian Walnut
Family Juglandaceae
USDA hardiness 4-8
Known Hazards None known
Habitats Mixed woods in rich soils, also by mountain streams[74]. Mixed forests on mountain slopes or in valleys at elevations of 500 - 2800 metres[266].
Range E. Asia - Manchuria.
Edibility Rating    (3 of 5)
Other Uses    (4 of 5)
Weed Potential No
Medicinal Rating    (1 of 5)
Care (info)
Fully Hardy Moist Soil Full sun
Juglans mandschurica Manchurian Walnut


http://commons.wikimedia.org/wiki/User:Qwert1234
Juglans mandschurica Manchurian Walnut
http://commons.wikimedia.org/wiki/User:Jean-Pol_GRANDMONT

 

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Summary


Physical Characteristics

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Juglans mandschurica is a deciduous Tree growing to 20 m (65ft 7in).
See above for USDA hardiness. It is hardy to UK zone 5. It is in flower from May to June, and the seeds ripen from September to October. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

Habitats

Woodland Garden Canopy;

Edible Uses

Edible Parts: Oil  Oil  Seed
Edible Uses: Oil  Oil

Seed - raw or roasted[183]. The kernels are well filled but difficult to extract because the shell is thick[74, 117, 183]. An edible oil is obtained from the seed[105, 183], it tends to go rancid quickly.

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Cancer  Miscellany

The cotyledons are said to be a cure for cancer[218].

References   More on Medicinal Uses

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Other Uses

Herbicide  Miscellany  Oil  Oil  Rootstock  String  Wood

The seed contains up to 52% oil and, as well as being edible, it has industrial uses[74]. A rope is made from the bark of young trees[74]. Plants produce chemicals which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree[18, 20, 159]. The roots of many members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.)[200]. The inner bark is used to make heel pieces for straw shoes[151]. Sometimes used as a rootstock to confer greater cold resistance[183]. Wood - hard, durable. Used for veneer, furniture etc[46, 61, 74].

Special Uses

References   More on Other Uses

Cultivation details

Requires a deep well-drained loam and a sunny position sheltered from strong winds[1, 11]. Prefers a slightly alkaline soil[200]. A very hardy and ornamental tree[1], it is recommended for cultivation in severe cold climates[183]. Plants produce a deep taproot and they are intolerant of root disturbance[1, 11]. Seedlings should be planted out into their permanent positions as soon as possible and given some protection for their first winter or two since they are somewhat tender when young[1, 11]. Flower initiation depends upon suitable conditions in the previous summer[200]. The flowers and young growths can be destroyed by even short periods down to -2°c, but fortunately plants are usually late coming into leaf[200]. Any pruning should only be carried out in late summer to early autumn or when the plant is fully dormant otherwise wounds will bleed profusely and this will severely weaken the tree[200]. Trees have a dense canopy which tends to reduce plant growth below them. We have no specific information for this species, but the roots of several members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.)[200]. The leaves of many species also secrete substances that have an inhibitory affect on plants growing underneath them. All in all this is not a very good companion plant[K]. Closely allied to J. cathayensis[11].

References   Carbon Farming Information and Carbon Sequestration Information

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Propagation

The seed is best sown as soon as it is ripe in individual deep pots in a cold frame[80]. You need to protect it from mice, birds, squirrels etc. The seed usually germinates in late winter or the spring. Plant out the seedlings into their permanent positions in early summer and give some protection from the cold for their first winter or two. The seed can also be stored in cool moist conditions (such s the salad compartment of a fridge) over the winter and sown in early spring but it may then require a period of cold stratification before it will germinate[78, 80, 113].

Other Names

If available other names are mentioned here

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Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Juglans ailanthifoliaJapanese WalnutTree20.0 4-8  LMHNM315
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Juglans californicaCalifornia Walnut, Southern California walnutTree6.0 7-10 MLMHNM212
Juglans cathayensisChinese WalnutTree20.0 4-8  LMHNM301
Juglans cinereaButternut - White Walnut, ButternutTree25.0 3-7 MLMHNM333
Juglans hindsiiHind's Black Walnut, Northern California walnut, Paradox hybrid walnutTree15.0 8-9 MLMHNM303
Juglans intermediaHind's Black Walnut, Northern California walnut, Paradox hybrid walnuHTree30.0 4-8  LMHNM301
Juglans majorArizona WalnutTree15.0 8-11 FLMHNM202
Juglans microcarpaTexas Walnut, Little walnut, Stewart's little walnutTree10.0 5-9  LMHNM203
Juglans neotropicaAndean WalnutTree25.0 10-12 SLMHNM324
Juglans nigraBlack WalnutTree30.0 4-9 FLMHNM334
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Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Expert comment

Author

Maxim.

Botanical References

1174200

Links / References

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Readers comment

Dr. S K Yadav   Wed Jun 11 2008

The mode of propagation of Juglans mandschurica is not clear from the article written above. Kindly give the details of the propagation.

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