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Wasabia japonica

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Elements of Structural and Systematic Botany
B and T World Seeds' Botanical Glossary

B and T World Seeds' reference number: 51105

The average, annual, minimum temperature zone where Wasabia japonica is cold hardy
USDA Zone:8 10° to 20°F   (-12° to -6.5°C)
Type of plant - perennial
Flower or inflorescence: WHITE, small, in raceme
Foliage: large, cordate
Height, in meters: 0.3
Height, in feet: 0.99
Wasabia japonica sales history

Common names for Wasabia japonica:

Eutrema Wasabi,  Eutrema wasabi,  Eutrema Wasabi,  Eutrema wasabi,  Japanese Horseradish,  Japanese Horseradish,  Japanischer Meerrettich,  Japanischer Meerrettich,  Wasabi,  Wasabi, 


Wasabia japonica is included in the following
B and T World Seeds flowering plant categories.

2:   Wants
We are looking for seeds from this plant, if you know where we can find seeds or would like to be told when we have a source, please let me know.
6:   Bulbous and Rhizomatous Plant Seed List
34:   Oriental Herb and Vegetable Seed List
Not all Oriental Herbs are Culinary, or even edible. Be sure to correctly identify and prepare all herbs and vegetables before use.
36:   Herb Seed List Culinary Medicinal Dye and Aromatic
Not all medicinal, dye or aromatic plants are edible, some are toxic if eaten and others are dangerous if applied to the skin. Please check uses for plants.
50:   Japanese Native and Introduced Plants
56:   Aquatic and Semi aquatic Plant Seeds
65:   World Coastal Tree and Plant Seed List
83:   Vegetable Seed List
185:   Plant Species whose germination is improved by Smoke
"Smoke" contains a butenolide compound produced by certain plants when heated, it speeds up or starts the germination of seeds from many different genera.
270:  Brassicaceae
709:  Cruciferae
720:   Fire Resistant Plants
Different classes of resistance: some grow back, some don't burn, a few have highly inflammable leaves that leave the rest of the plant intact, some trees don't have lower branches.



Wasabia japonica, plants with roots

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Happier and Healthier Plants, Naturally

plant-fungus communities, for improved nutrition, and disease and drought resistance.


Germination guide for Wasabia japonica

These notes are a general guide, it is recommended to check specialist literature for some of the more unusual seeds in our lists.
Seed Germination Theory and Practice by Professor Norman C. Deno
Some knowledge about growing from seed is necessary to germinate even the easiest seeds. Most seeds require humidity to germinate, even desert plants like Welwitschia mirabilis require that their growing medium remains moist until germination.

Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet, the seeds may not get the oxygen they require.
Some seeds need to be in the light (surface sown) or in the dark (sown deep enough to receive little or no light) to germinate. A rule of thumb is to cover the seeds their own width deep in the growing medium, but some seeds prefer to be sown much deeper, and some fairly large seeds like to be surface sown (or higher).
Many seeds germinate best at certain temperatures, some will germinate at a comparatively wide range of temperatures, yet others need fluctuating temperatures.
Almost all seeds are waiting in a dormant state for some outside stimulus to break their dormancy, some just need sufficiently high ambiant humidity, others need scarification, vernalization or to be passed through the intestines of an animal.

Wasabia japonica seeds will usually germinate in 20 days, if conditions are favourable.
Normally germinates in the dark. Sow Wasabia japonica seeds about 8mm deep in a medium like river grit; a slightly acidic, free draining, moisture retentive, organically rich seed sowing mix at about 5 to°C.

Wasabia japonica seeds need to be "overwintered" before they will germinate.

Stratification; cold treatment or vernalization. Seeds of some species need just a couple of weeks, others 3 months. Seeds can be stratified in dampened peat or sand, in a plastic box or bag at 4°C or 5°C in a refrigerator. The seeds should not be frozen or in a wet medium. Very small seeds can be sown on the surface of their growing medium, in pots sealed in plastic bags, and kept in the 'fridge. Many vernalized seeds need light to germinate when they are sown in the "Spring".
Seed Germination Theory and Practice by Professor Norman C. Deno

Do not let Wasabia japonica seeds dry out. Cool, damp conditions are necessary. Cold frame. Gibberellic acid. Scarification can work very well. The "seed coat" inhibits germination.


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