Armoracia rusticana

Other names: Křen

Pungent horseradish root; pickling and seasoning.

Large leaves and a perennial thick mustardy root.

Family: Brassicaceae
Plant type: Perennial herb
Safety level (indicative): Generally recognised as safe

What the safety levels mean (expand legend)

Generally recognised as safe. Often a common herb with reasonable harvest and use; still read the specific warnings on the card.
Information. Primarily informational — details in the text and warnings below matter most.
Caution. Needs extra care (dose, duration, sensitive groups, interactions).
Risky. Significant risks — verify sources, contraindications and professional guidance.
Not for home experimentation. Not suitable to experiment with at home without knowledge and certainty.
High risk for internal use. Particular risk with internal use (e.g. alkaloids); avoid prolonged or irresponsible dosing.
Not specified. Level not filled in yet — rely on individual warnings and links below.

Quick overview

A practical summary; details are in the sections below.

Safety grade: Generally recognised as safe·details
Scientific sources on the card: Yes — sources are listed with claims·Science section
When and what to harvest: Root — October–November
Full harvest section
Processing methods: Culinary use, Fermentation
All methods and recipes on the card
Topics and symptoms: No topic links yet.Topics section · Symptoms overview

Identification and mix-ups

Mustard sting when grated.

Possible mix-ups and risks

Leaves can resemble some brassicas—root is decisive.

Similar herbs

No related herbs are linked yet.

Topics and symptoms

More topics are in the symptoms and topics overview.

No topic links are recorded yet.

Geographic occurrence

Czechia
Common (expected wild occurrence in the region)
Austria
Occasional (garden, cultivation, or fringe of the range)
Germany
Occasional (garden, cultivation, or fringe of the range)
Hungary
Occasional (garden, cultivation, or fringe of the range)
Poland
Occasional (garden, cultivation, or fringe of the range)
Slovakia
Occasional (garden, cultivation, or fringe of the range)

Harvest

RootOctober–November
podzim
Region: Czechia
Notes: Harvest note (full translation pending): Koren po odkveteni nebo jarni vykop.

Storage

Drying(Root)
Kořen usušený nebo sterilně nakládaný.
Light:
Chlad a tma.
Moisture:
Vlhko podporuje plísně.

Processing methods on this herb card

Culinary use(Root)Suitability: High suitability
Cooking, baking, seasoning as food — general category without therapeutic claims.
Full method description (from the catalogue)
Culinary use covers herbs as ingredients in dishes, drinks, or spice mixes. This overview does not evaluate medicinal effects — only reminds you about species intent, allergies, and heat treatment where needed (e.g. some fruits or plant parts).
Combining with alcohol, sugar, or long cooking changes outcomes; verify culinary sources.
Traditional context for this method: yes·Scientific context for this method: no
Procedure (recipe)
Freshly grated horseradish
About 10 min · Difficulty: Beginner
1. Peel the root and grate finely just before eating — aroma fades quickly.
2. Serve with meat or stir into sauces; start with a small portion — very pungent for mucous membranes.
Thyroid issues — see the herb card.
Why this way (extraction / behaviour of constituents)
Home preparation following this recipe is mainly educational and cultural; it should not be assumed to match the extractive or safety profile of registered medicines or standardized extracts. Check specific effects, drug interactions, and contraindications on the herb card and with your clinician if you use prescription drugs.
What is typically released
orientační domácí extrakce — profil závisí na teplotě, čase řezu a poměrech
Solvent / water
mediální složení (voda, alkohol, olej, med…) viz jednotlivé kroky
After preparation
po přípravě uchovávej hygienicky a podle typu výrobku (chlad, světlo, alkohol)
Extra literature for the recipe
- Vyhledávání studií (PubMed apod.)Konkrétní vědecká tvrzení ověř na kartě byliny a v primární literatuře.
Fermentation(Root)Suitability: High suitability
Microbial processing (fermentation) of plant material for drinks or foods.
Full method description (from the catalogue)
Fermentation changes sugars, flavour, and microbial composition (e.g. herbal ferments, oxymels combining honey and vinegar per tradition). Hygiene, temperature, and time are critical for a safe outcome.
Home ferments should not smell “rotten”; when in doubt, discard.
Traditional context for this method: yes·Scientific context for this method: no
Procedure (recipe)
Fermented horseradish brine
About 40 min · Difficulty: Advanced
1. Put grated horseradish in a clean jar and cover with a mild brine, or follow a kimchi-style horseradish recipe you trust.
2. Ferment cold under weight or with an airlock for about 3–10 days depending on the recipe.
3. Use sterile jars and watch pH — discard if mould appears; caution if you have thyroid issues.
Home fermentation needs hygiene; this is not a sterile industrial product.
Why this way (extraction / behaviour of constituents)
Home preparation following this recipe is mainly educational and cultural; it should not be assumed to match the extractive or safety profile of registered medicines or standardized extracts. Check specific effects, drug interactions, and contraindications on the herb card and with your clinician if you use prescription drugs.
What is typically released
orientační domácí extrakce — profil závisí na teplotě, čase řezu a poměrech
Solvent / water
mediální složení (voda, alkohol, olej, med…) viz jednotlivé kroky
After preparation
po přípravě uchovávej hygienicky a podle typu výrobku (chlad, světlo, alkohol)
Extra literature for the recipe
- Vyhledávání studií (PubMed apod.)Konkrétní vědecká tvrzení ověř na kartě byliny a v primární literatuře.

Traditional / spiritual use

Kept separate from science — entries are cultural or symbolic, not medical advice.

Related guides in the library

Field horseradish and a leaf landscape without the root (symbolic)

Traditional folk context
General
The herb appears in older folk customs referenced on Czech cards. This note is cultural memory and seasonal storytelling — not a dosing guide, clinical indication, or substitute for the safety section.
Form:
různé
Claim strength:
Tradition
Source note:
Cultural framing only.

Scientific notes

Each claim lists a study type and a source (URL or DOI) where available. Dose notes from the literature are informational only.

How to read evidence strength and study type labels

Labels summarise how the catalogue entry is tagged — they are not a medical verdict on efficacy. For every row, read the summary, limitations and source link.

Evidence strength

Evidence level not specified: The author did not grade the record; judge from the summary, limitations and source link.
Narrative / orientational literature: Descriptive or expert literature without controlled group comparison — context rather than proof of effect.
Weak evidence: Study or conclusion with major methodological limits; treat only as a pointer for further reading.
Preliminary findings: First or smaller studies — interesting direction, not the final word on efficacy or safety.
Moderate strength of evidence: Moderate strength by study design; sample and context limits still apply.
Stronger evidence: Stronger design or consistency of results within the study’s stated limits.
Review article: A review summarises multiple sources; quality depends on review method and field.

Study type

Narrative / expert text: Expert text or overview without a classical study design.
In vitro study: Cell culture or test-tube experiment — does not show an effect in the body.
Animal study: Animal model — transfer to humans is not automatic.
Observational study: Observing groups without random treatment assignment; confounding is possible.
Clinical trial: Human clinical trial; sample size and control group matter.
Randomised controlled trial: Randomised controlled trials are among the stronger designs when well conducted.
Review study: A review aggregates multiple papers — quality depends on selection rules.
Systematic review: Systematic review with explicit search and selection methodology.
Meta-analysis: Statistical pooling of studies; outcome depends on input data and heterogeneity.
Regulatory assessment / monograph (EMA, WHO…): Regulatory body summary for a herbal product — different context from a single RCT; often about products, not home tea.
Expert monograph (herbal preparations): Structured literature summary for a plant or drug — quality depends on author and edition year.

Evidence summary (full translation pending): O ucincich a bezpecnosti existuje odborna literatura; zaznam je orientacni a nenahrazuje peci odbornika.
Evidence level not specifiedNarrative / expert text
Limitations: Limitations (translation pending): Seed katalogu — dopln konkretni studie podle obsahu.
Vyhledávání studií (PubMed apod.)

Images

No uploaded images yet.

Safety

What the warning types mean

The type on each warning helps group themes — it does not replace the separate severity badge.

Internal use: Risks from swallowing, extracts, duration of use or concentration for internal use.
Interactions / medicines: Possible effect on medicines or concurrent treatment — check sources and a professional.
Raw plant parts: Raw, unripe or poorly prepared plant parts can be dangerous.
Toxins and regulation: Toxic constituents or regulated compounds (e.g. in distillates).
Contact with the plant: Skin or mucosa irritation from contact with fresh plant or sap.
Allergy: Allergic reactions, often linked to family sensitisation.
Harvesting and contamination: Contamination, species mix-ups or harvesting from unsuitable places.

Safety information (full translation pending)Low severitythyroid
This warning is being translated to English. Czech editor text: Stitna zlaza Kren a dalsi brukvovite horcice mohou ovlivnit vstrebavani jodu u predisponovanych jedincu — pri tyreopatii se informuj u lekare.