Practical
Plants

Rumex japonicus

a perennial member of the Rumex genus in the family Polygonaceae.

No photo available

Taxonomy and growth

Genus
Rumex
Life cycle
perennial
Height
1 m
Fertility
Wind
Flower type
hermaphrodite
Pollinators
Wind

Uses

Toxicity

Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.

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

Plants can contain quite high levels of oxalic acid, which is what gives the leaves of many members of this genus an acid-lemon flavour. Perfectly alright in small quantities, the leaves should not be eaten in large amounts since the oxalic acid can lock-up other nutrients in the food, especially calcium, thus causing mineral deficiencies. The oxalic acid content will be reduced if the plant is cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[6].

Edible uses

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

Leaves - cooked[1][3]. They can be used as a vegetable or added to soups[4]. The leaves can also be dried for later use[4]. Seed - cooked[1][3]. It is used with rice or ground into a powder for making dumplings[4].

Plant part
Leaves
Plant part
Seed

Material uses

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

Although no specific mention has been made for this species, dark green to brown and dark grey dyes can be obtained from the roots of many species in this genus, They do not need a mordant[2].

Product or use
Dye

Environment

Range
E. Asia - China, Japan, Korea.
Habitat
Wet meadows and ditches in lowland all over Japan[8]. Field margins, streambanks and wet valleys from sea level to 3400 metres in China[7].
Light
full sun
Shade tolerance
light 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.

Seed - sow spring in situ. Division in spring.

Cultivation

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

We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in most parts of this country. The following notes are based on the general needs of the genus. Succeeds in most soils but prefers a deep fertile moderately heavy soil that is humus-rich, moisture-retentive but well-drained and a position in full-sun or part shade[5].

References

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

    ↩1↩2

  2. Grae. I. Nature's Colors - Dyes from Plants. MacMillan Publishing Co. New York. 1974-00-00 ISBN 0-02-544950-8

    ↩

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

    ↩1↩2

  4. Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990-00-00 ISBN 0-9628087-0-9

    ↩1↩2↩3

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

    ↩

  6. Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995-00-00 ISBN 0-7513-020-31

    ↩

  7. Flora of China 1994-00-00 http://flora.huh.harvard.edu/china/

    ↩

  8. Ohwi. G. Flora of Japan. (English translation) Smithsonian Institution 1965-00-00

    ↩

Edit this page