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Pterocarya rhoifolia

Common name:	Japanese Wingnut	Family:	Juglandaceae
Author:	Siebold.&Zucc.	Botanical references:	11, 58, 200
Synonyms:
Known Hazards:	None known
Range:	E. Asia - China, Japan.
Habitat:	Valleys and mountains all over Japan[58]. Wet areas along riverbanks and mountain streams in eastern Shandong, China[266].
Edibility Rating (1-5):	1	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	P. sorbifolia[G]
Systematics:	From a USDA Plants Database
	Order: Juglandales. Walnut family

Physical Characteristics

A decidious tree growing to 30m. It is hardy to zone 6 and is frost tender. It is in flower in June, and the seeds ripen from October to December. The scented flowers are monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and are pollinated by Wind. We rate it 1/5 for edibility and 0/5 for medicinal use.

The plant prefers medium (loamy) and heavy (clay) soils. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist soil.

Habitats and Possible Locations

Woodland, Canopy.

Edible Uses

Seed.

Seed[105]. No more details are given but the seed is very small and would be very fiddly to use.

Medicinal Uses

Disclaimer

None known

Other Uses

Wood.

Wood - light, soft, not easily cracked. Used for clogs, chopsticks etc.

Cultivation details

Prefers a sunny position in a rich strong loam with abundant moisture at the roots[11, 200].
Succeeds in areas that do not experience prolonged winter temperatures below about -12°c[200], but young plants and the young shoots of older trees can be cut back by winter frosts[11].
The leaves are aromatic when bruised[245].
Plants in this genus are notably resistant to honey fungus[200].

Propagation

Seed - best sown as soon as it is ripe in a cold frame[80, 113]. Pre-soak stored seed for 24 hours in warm water[80] then cold stratify for 2 - 3 months[98, 113]. Prick out the seedlings into individual pots as soon as they are large enough to handle and grow them on in the greenhouse for their first winter. Plant them out in late spring or early summer of the following year[240].
Cuttings of half-ripe wood, July/August in a frame[113].
Cuttings of mature shoots, November in a frame. Only use vigorous shoots[113].
Layering.
Division of suckers in the dormant season[188].

Scent

Leaves: Crushed: The leaves are aromatic when bruised[245].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for pterocarya rhoifolia (a possible synonym).

[HP] PhotoFrom Henriette's plant pictures

References for the family Juglandaceae.

[CHINA] Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[58] Ohwi. G. Flora of Japan. (English translation) Smithsonian Institution 1965
The standard work. Brilliant, but not for the casual reader.

[80] McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985 ISBN 0-901361-21-6
Does not deal with many species but it is very comprehensive on those that it does cover. Not for casual reading.

[98] Gordon. A. G. and Rowe. D. C. f. Seed Manual for Ornamental Trees and Shrubs.
Very comprehensive guide to growing trees and shrubs from seed. Not for the casual reader.

[105] Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing 1976
The most comprehensive guide to edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[188] Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990 ISBN 0-86318-386-7
Excellent range of photographs, some cultivation details but very little information on plant uses.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[240] Chopra. R. N., Nayar. S. L. and Chopra. I. C. Glossary of Indian Medicinal Plants (Including the Supplement). Council of Scientific and Industrial Research, New Delhi. 1986
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.

[245] Genders. R. Scented Flora of the World. Robert Hale. London. 1994 ISBN 0-7090-5440-8
An excellent, comprehensive book on scented plants giving a few other plant uses and brief cultivation details. There are no illustrations.

[266] Flora of China 1994
On-line version of the Flora - an excellent resource giving basic info on habitat and some uses.

Readers Comments

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Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
Website: www.pfaf.org Phone: 0845 458 4719/_44(0) 1208 872963

This page (UK) http://www.comp.leeds.ac.uk/cgi-bin/pfaf/arr_html?Pterocarya+rhoifolia
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We make no claims of magical effects or supernatural powers for any item in this catalog. In spite of legendary attributes or occult and craft tradition, such items are offered as curios only and beliefs concerning their magical effectiveness are related only for historical interest.