Practical
Plants

Juglans sinensis

a perennial woody deciduous member of the Juglans genus in the family Juglandaceae.

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Taxonomy and growth

Genus
Juglans
Life cycle
perennial
Foliage
deciduous
Woodiness
woody
Height
20 m
Fertility
Self fertile, Wind
Flower type
monoecious
Pollinators
Wind

Uses

Edible uses

This section contains historical Plants For A Future notes marked noncommercial.

Seed - raw[2][7]. It contains 15.8% protein, 66.9% fat, 10.8% carbohydrate and 1.8% ash[8]. An edible oil is obtained from the seed, it tends to go rancid quickly.

Product or use
Oil
Plant part
Seed

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

The seed is used in Korea to treat spermatorrhoea, frequent urination and dermatitis[12]. The seed contains gangliosides, but no specific bioactivity has been recorded[12].

Product or use
Skin

Material uses

This section contains historical Plants For A Future notes marked noncommercial.

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[9][10][6]. The roots of many members of this genus also 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.)[11].

Product or use
Herbicide

Ecology and functions

Ecosystem niche
Canopy

Environment

Range
E. Asia - China, Korea.
Habitat
Not known in a truly wild situation.
Light
full sun
Shade tolerance
no shade
Water
moderate
Soil textures
sandy, loamy, clay
Soil pH
acid, neutral, alkaline
Drainage
well drained
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

The seed is best sown as soon as it is ripe in individual deep pots in a cold frame[14]. 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[13][14][5]. This is possibly a hybrid species and so it might not breed true from seed.

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

Requires a deep well-drained loam and a sunny position sheltered from strong winds[1][4]. Prefers a slightly alkaline soil[11]. Considered to be no more than a part of J. regia by some botanists[3], whilst others think that it might be a hybrid between J. mandschurica and J. regia[7]. Plants produce a deep taproot and they are intolerant of root disturbance[1][4]. 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][4]. Flower initiation depends upon suitable conditions in the previous summer[11]. 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[11]. 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[11]. 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.)[11]. 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].

References

  1. F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00

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  2. Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing 1976-00-00

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  3. Wilson. E. H. Plantae Wilsonae.

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  4. Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981-00-00

    ↩1↩2↩3

  5. Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987-00-00 ISBN 0942375009

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  6. McPherson. A. and S. Wild Food Plants of Indiana. Indiana University Press 1977-00-00 ISBN 0-253-28925-4

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  7. Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books 1984-00-00 ISBN 3874292169

    ↩1↩2

  8. Reid. B. E. Famine Foods of the Chiu-Huang Pen-ts'ao. Taipei. Southern Materials Centre 1977-00-00

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  9. Philbrick H. and Gregg R. B. Companion Plants. Watkins 1979-00-00

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  10. Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. 1978-00-00 ISBN 0-88266-064-0

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  11. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2↩3↩4↩5↩6

  12. Medicinal Plants in the Republic of Korea World Health Organisation, Manila 1998-00-00 ISBN 92 9061 120 0

    ↩1↩2

  13. Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948-00-00

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  14. McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985-00-00 ISBN 0-901361-21-6

    ↩1↩2

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