Eutrema Species, Wasabi, Japanese Horseradish

Eutrema japonicum

Family: Brassicaceae (brass-ih-KAY-see-ee) (Info)
Genus: Eutrema
Species: japonicum (juh-PON-ih-kum) (Info)
Synonym:Alliaria wasabi
Synonym:Cochlearia wasabi
Synonym:Eutrema wasabi
Synonym:Wasabia japonica
Synonym:Wasabia wasabi




Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Very high moisture needs; suitable for bogs and water gardens

Sun Exposure:

Light Shade

Partial to Full Shade


Grown for foliage

Foliage Color:

Unknown - Tell us


6-12 in. (15-30 cm)


6-9 in. (15-22 cm)


USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Where to Grow:

Unknown - Tell us



Bloom Color:

White/Near White

Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Winter/Early Spring

Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

Unknown - Tell us


This plant is said to grow outdoors in the following regions:

Birmingham, Alabama

Weismain, Bayern(127 reports)

Nipomo, California

Portland, Oregon

Jáltipan de Morelos, Veracruz-Llave(45 reports)

Mukilteo, Washington

Sequim, Washington

Vancouver, Washington

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Gardeners' Notes:


On May 2, 2016, Ted_B from Birmingham, AL (Zone 8a) wrote:

You've probably been told discouraging things that made you shy away from growing wasabi, but be discouraged not.

This species is predominantly shade loving, but accepts some morning sun without trouble. Of 10 small starts planted in containers in early spring, 2 failed quickly, leaving 8 survivors. Growth medium is a mixture of 2/3 hardwood compost and 1/3 pea gravel. This container grown media is well drained, with plants watered every morning until well rooted, and given periodic doses of fertilizer. Plants remained in active growth in cool weather, with growth gradually slowing as a long, hot summer arrived.

It is often claimed that wasabi does not survive in hot climates. This is not my experience. My own container grown plants have withstood our longes... read more


On Dec 20, 2012, pigneguy from Los Angeles, CA wrote:

i purchased a packet of seeds from somewhere. Just a few seeds inside. Only one of them germinated. It's about 6 months later now, mid December, and it's thriving in a Southern California winter. Really enjoys the rain and low temps.


On Jul 11, 2006, Silphion from Portland, OR (Zone 8b) wrote:

This is a hard plant to keep happy but (so far, for me at least) it has proven resiliant to several lapses on my part. There is a lot of conflicting information, even taken directly from the mouths' of the growers.

I got my first Wasabi from "The Frog Farm" in Seattle; I was in town and the owner graciously allowed me to drop by and see his set-up: deep beds of heavily composted soil covered with a shade cloth, watered regularly (I believe he said first thing in the morning then again in the hottest part of afternoon.) He told me that they had never had disease from repetedly deviding the roots which is a common story you hear from Wasabi pureists. I got a mature specimin that would eventually devide into 3-4 seperate plants and almost as soon as he had it out of the grou... read more


On Nov 11, 2005, Terry from Murfreesboro, TN (Zone 7a) wrote:

Grown mainly for its edible, pungent roots that are used like Horseradish (Armoracia rusticana). The long, finger-thick roots lose their pungency once cut. This is not a quick-cropping plant - it can take 3 to 5 years from seed to harvest and the seeds are reported to be reluctant to break dormancy.