Eutrema japonicum
Enable an agent to recognize Eutrema japonicum, assess living plants and their growing conditions, and decide whether to retain, propagate, investigate or harvest them.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognize Eutrema japonicum, assess living plants and their growing conditions, and decide whether to retain, propagate, investigate or harvest them.
Eutrema japonicum, commonly called wasabi, is a perennial flowering plant in the mustard family Brassicaceae, native to Japan and cultivated chiefly for its pungent rhizome, which is grated as a condiment.
It can be Compare a specimen with botanical evidence and retain unresolved identifications explicitly.; Trace a cultivated plant to its supplier, accession and propagation parent.; Monitor rhizome growth and leaf condition against recorded environmental exposure.; Evaluate changes to shade, watering or circulation against a documented cultivation protocol.; Select candidate propagation material after checking identity and condition.; Assess harvest readiness against an explicit organ-specific objective..
Distinguishing features
Resolve the botanical name: Eutrema japonicum is accepted, and Wasabia japonica is a synonym rather than a separate organism model. [Kew POWO](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:284345-1)
Check for broad, heart-shaped leaves with toothed margins and long stalks; use these as screening characters, not conclusive species identification. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
Record the thickened rhizome separately from true roots when assessing material described commercially as wasabi root. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
Reject identification based solely on the name Japanese horseradish: horseradish is separately identified as Armoracia rusticana. [RHS](https://www.rhs.org.uk/herbs/horseradish/grow-your-own)
For ambiguous Eutrema specimens, require a documented botanical determination rather than treating pungency, green color or a nursery label as a species test.
Scope
+ Species identification, botanical synonyms and identification confidence
+ Plant provenance, cultivar claims and propagation lineage
+ Leaf, crown, rhizome and root condition
+ Growing environment and observed plant responses
+ Development, propagation readiness and harvest assessment
- Other Eutrema species and Armoracia rusticana
- Prepared wasabi pastes, powders and blended condiments
- Detached food lots, recipes and food-processing operations
- Farm infrastructure, irrigation equipment and commercial operations
- Isolated chemical substances and medical efficacy claims
Characteristics
- Identification confidence
- label-only | morphology-supported | expert-confirmed | unresolved Determines whether species-specific assessments can be applied confidently.
- Cultivar and accession lineage
- Named cultivar or unknown; linked supplier, accession and parent plant Keeps inherited identity claims distinct from verified species identity.
- Plant origin
- wild-observed | wild-collected | cultivated | unknown Separates occurrence evidence from cultivation history.
- Developmental condition
- seedling | establishing division | established vegetative plant | flowering | fruiting | declining Supports decisions about observation, propagation and harvest.
- Rhizome dimensions
- Length and diameter in mm, with measurement landmarks and date Allows growth and harvest criteria to be evaluated without confusing roots with rhizomes.
- Growing system
- streambed | soil bed | container | hydroponic system | wild site | other Provides context for interpreting moisture, temperature and root condition.
- Air and root-zone temperature
- °C; separate sensor positions, observation periods and extremes Allows observed stress to be compared with actual exposure.
- Canopy light exposure
- Photosynthetic photon flux density in µmol m−2 s−1 and direct-sun duration in h/day Makes shading decisions assessable.
- Root-zone water condition
- drying | moist and draining | flowing-water contact | stagnant saturation | unknown Distinguishes water availability from drainage or circulation problems.
- Organ damage
- Affected organ, lesion count or affected area %, with dated photographs Tracks deterioration without assuming a pathogen from symptoms.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 7 bundles · 13 layers · 19 findings · 31 questions.
Wasabi identity Determine whether a plant belongs to the registered species.
Common names and commercial wasabi labels do not establish botanical identity.
Taxonomic name
Connect supplied names to the accepted species concept.
Accepted name and synonym
Eutrema japonicum belongs to Brassicaceae; Wasabia japonica is a botanical synonym, not an additional registry split. [Kew POWO](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:284345-1)
- Which botanical name and authority were supplied with this plant? definition
- Which consulted taxonomic reference resolves that name to Eutrema japonicum? provenance
Specimen determination
Assess evidence available from the actual plant.
Identification evidence
Keep observed characters, determination method and unresolved alternatives together; a trade label alone is insufficient.
- Which leaf, rhizome, flower or fruit observations support the identification? measurement
- Which similar taxa remain unexcluded, and what additional evidence would distinguish them? boundary
Origin and lineage Separate geographic occurrence, cultivation history and cultivar identity.
A wasabi plant's location does not establish native status or its cultivar.
Occurrence context
Record where and under what circumstances a plant occurs.
Native range versus recorded site
Kew gives the native range as southern Korea and southern Sakhalin to Japan; individual records still require origin evidence. [Kew POWO](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:284345-1)
- Where and when was this plant observed or obtained? provenance
- What evidence distinguishes a wild occurrence from planting or escape at this site? boundary
Cultivated lineage
Track accession, cultivar and parentage claims.
Cultivar claim traceability
Treat cultivar names as attributed claims until supported by supplier or accession records.
- Which record supports the cultivar name attached to this plant? provenance
- Was this plant raised from seed or vegetatively obtained from a recorded parent? provenance
Rhizome and development Assess organ identity, growth and reproductive condition.
Wasabi assessment must distinguish the harvestable rhizome from roots and from whole-plant maturity.
Organ recognition
Locate and measure the structures being assessed.
Rhizome measurement
Record rhizome dimensions separately from root spread and leaf size.
- Which observed structure is being identified as the rhizome? definition
- What are its length and diameter at repeatable measurement landmarks? measurement
Developmental observation
Track growth and reproductive transitions over time.
Stage and growth history
Evaluate readiness from dated observations rather than assuming a universal harvest age.
- What vegetative or reproductive stage is visible now? measurement
- How have rhizome dimensions and new-leaf production changed since the previous observation? measurement
Wasabi growing environment Relate growing-system conditions to plant response.
Moisture, shade and root-zone conditions need separate assessment rather than a single wet-site label.
Shade and temperature
Document canopy exposure and thermal conditions.
Cool shaded setting
Extension guidance emphasizes cool, shaded growing conditions; numeric operating limits require a locally applicable protocol. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
- What light exposure and air and root-zone temperatures did the plant experience? measurement
- What recorded response would justify changing shade or cooling? action
Water and root zone
Assess moisture alongside drainage or water circulation.
Moisture with drainage
Soil cultivation guidance combines moisture retention with drainage. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
- Is this plant in soil, substrate or a flowing-water system, and how is water supplied? definition
- What observations show drying, adequate moisture or stagnant saturation around the roots? measurement
Condition and intervention Connect organ-level symptoms to proportionate investigation and action.
Rhizome damage affects both plant survival and harvest assessment, while visible symptoms may have several causes.
Symptom assessment
Separate visible deterioration from confirmed cause.
Leaf root and rhizome damage
Leaf spot and root or rhizome rot are reported problems; record symptoms before assigning a diagnosis. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
- Which organs show discoloration, lesions, tissue softening or loss? measurement
- What examination or diagnostic evidence supports the proposed cause? provenance
Intervention assessment
Make cultivation changes and investigations reviewable.
Response-based action
Link each proposed intervention to symptoms, environmental records and a follow-up criterion.
- Does the evidence support an environmental adjustment, isolation or diagnostic referral? action
- Which observable change and review date will determine whether the intervention helped? measurement
Propagation and harvest Assess whether to reproduce, retain or harvest the plant.
Propagation preserves lineage, while rhizome harvest changes the status of the living plant and produces material owned by neighbouring models.
Propagation material
Identify candidate material and retain its lineage.
Propagule selection
Wasabi can be propagated through plantlets or rhizome division. [NC State Extension](https://plants.ces.ncsu.edu/plants/eutrema-japonicum/common-name/japanese-horseradish/)
- Which candidate plantlet or division is available, and what is its observed condition? measurement
- How will the resulting plant remain linked to the identified parent and cultivar claim? provenance
Harvest boundary
Apply an explicit harvest objective and record the transition to detached material.
Organ-specific harvest decision
Assess the intended organ against recorded criteria, then link detached material to a separate harvest or food-lot record.
- Which organ is intended for harvest, and what size and condition criteria apply? action
- What remains of the living plant after harvest, and which record receives the detached material? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge, not a researched account; verify current taxonomic treatment and native distribution first.
- Daruma and Mazuma are cultivar names, not formal botanical varieties.
- No cultivation measurements or specific regulatory requirements are asserted.
- Which of these check these first hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Daruma cultivar
- Mazuma cultivar
- Which of these kinds and varieties hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Botanical nomenclature (ICN) - Eutrema japonicum (Miq.) Koidz. - Wasabia japonica (Miq.) Matsum. is a widely encountered scientific synonym.
- Which of these identifiers and schemes hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Freshly grated rhizome served with sushi, sashimi and other foods.
- Leaves and petioles used in pickles and other culinary preparations.
- Cultivation in managed flowing-water beds and suitable soil-based systems.
- Which of these real-world use hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Heat stress and drying can impair growth.
- Poor drainage and disease can cause root and rhizome rot.
- Pungent isothiocyanates released when tissue is damaged can irritate the eyes, nose and mouth.
- Grated wasabi loses pungency and aroma during storage.
- Products sold as wasabi may contain predominantly horseradish and mustard rather than Eutrema japonicum.
- Which of these failure modes and hazards hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Japanese cultivation distinguishes water-grown wasabi, often called sawa-wasabi, from soil-grown oka-wasabi; these are production systems rather than separate species.
- Outside Japan, the name wasabi often denotes a prepared condiment whose botanical ingredients require checking.
- Which of these regional variation hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Armoracia rusticana - Horseradish is a separate brassicaceous species whose pungent root is commonly used in wasabi substitutes.
- Wasabia japonica - A scientific synonym for the same species, not a separate registered organism.
- Wasabi paste - A prepared food product rather than the plant species; it may contain authentic wasabi, substitutes or both.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of Eutrema japonicum this model covers, and on what evidence? provenance
What the second pass must settle
- Which diagnostic key and, where necessary, molecular markers reliably separate Eutrema japonicum from closely related Eutrema taxa at each developmental stage?
- Which cultivar-specific temperature, light, water-quality and substrate limits are supported for the intended growing system?
- Which seed storage, dormancy and germination protocols are validated for the accession being modeled?
- Which diagnostic methods distinguish local causes of root and rhizome deterioration from environmental injury?
- Which harvest criteria predict acceptable rhizome quality without relying on a universal plant age or unsupported sensory assumptions?