Wasabia japonica - (Miq.)Matsum.
Common Name Japanese Horseradish, Wasabi
Family Brassicaceae or Cruciferae
USDA hardiness 7-10
Known Hazards None known
Habitats Wet places and by streams, in lowland and mountain areas[58]. Usually found near the coast[200].
Range E. Asia - Japan.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Frost Hardy Wet Soil Water Plants Semi-shade Full sun

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UPDATE 12/09/2011: This name is a synonym of Eutrema japonicum (Miq.) Koidz..

Wasabia japonica Japanese Horseradish, Wasabi

Wasabia japonica Japanese Horseradish, Wasabi
Physical Characteristics
 icon of manicon of flower
Wasabia japonica is a PERENNIAL growing to 0.3 m (1ft) by 0.2 m (0ft 8in).
It is hardy to zone (UK) 8. It is in flower from Apr to May. The flowers are hermaphrodite (have both male and female organs)Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers wet soil and can grow in water.

Eutrema wasabi.

 Pond; Bog Garden;
Edible Uses
Edible Parts: Leaves;  Root.
Edible Uses: Condiment.

Root - a horseradish substitute[2, 46, 58, 61, 105]. The fleshy rhizomes are finely grated and prepared into an attractive fresh green paste which is much used as a condiment in Japan[183]. It is considered to have a distinct flavour and pungency that is superior to horseradish, Armoracia rusticana[183]. The pungency rapidly deteriorates once the root has been cut[200]. Roots of plants 15 - 24 months old are best[238]. Leaves, flowers and petioles - cooked[105, 179, 200]. The leaves, flowers, leafstalks and freshly sliced rhizome are soaked in salt water and then mixed with saki lees to make a popular Japanese pickle called 'wasabi-zuke'[183]. The following analysis is said to belong to the leaves but it looks more like a root analysis[K]. The leaves contain about 6.1% protein, 0.2% fat, 22.3% carbohydrate, 1.3% ash[179].
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.


The root is a pungent warming herb that stimulates the digestion[238]. It is used internally as an antidote to fish poison[238]. (This probably refers to food poisoning caused by eating fish[K]).


Other Uses
None known
Cultivation details
Prefers a position in wet soil or shallow water. The best quality roots are produced from plants growing in semi-shade in clear running spring water at a temperature between 11 - 14°c[200]. This species is cultivated in eastern Asia for its edible root which is used in much the same way as horseradish[58], it takes 3 - 5 years to produce marketable roots[116]. The roots are finger-thick and up to 18cm long[206].
Seed - sow spring in a greenhouse and keep the seed permanently moist[238]. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the greenhouse for their first year. Stand the pots in shallow water to ensure the plants do not dry out. Plant them out in late spring or early summer. Division in spring as the plant comes into growth. Very easy, the larger divisions can be planted out direct into their permanent positions. We have found that it is best to pot up smaller divisions and grow them on in light shade in a greenhouse or cold frame until they are growing away well. Plant them out in the summer or the following spring.
Other Names
Found In
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


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Botanical References
Links / References
For a list of references used on this page please go here
Readers comment
   Tue Nov 29 2005
Give more information about the plant.like its class, order, and other things like that
Dr Brian Oates, President and Chief Research Officer   Tue Apr 4 2006

Pacific Coast Wasabi Ltd Much relevant up to date information on the culinary and biomedical uses of Wasabi.

Doug Lambrecht, CEO - Real Wasabi, LLC   Sun Apr 1 2007
www.realwasabi.com offers a wealth of information about cultivation and processing of wasabia japonica as well as its use in contemporary and traditional cusine.

Real Wasabi - celebrating the authenticity of Wasabia japonica Premium source for fresh, dried and frozen authentic wasabi products

Alejandro gunst   Fri Oct 17 2008
Hi, do you know where can I buy seeds from the wasabia japonica? thanks Alejandro Gunst
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Subject : Wasabia japonica  

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