Poisonous plants
Belladonna, foxglove, oleander, poison hemlock and castor bean can cause serious or fatal poisoning. Never experiment with them.
Arnica
Arnica montana
Plant part: Flower
Traditionally used in external preparations
Botanical Identification & Species
Recorded botanical identity
Arnica — Arnica montana. Arnica montana (Asteraceae) is a perennial with basal leaves, usually opposite stem leaves and yellow daisy-like flower heads. Flower is the recorded part. A yellow flower alone is not diagnostic; whole-plant characters and provenance are essential.
Species, varieties and lookalikes
Arnica chamissonis may occur in some cultivated products but is a distinct species. “Mexican arnica” can refer to unrelated Heterotheca species and is not interchangeable. Leopard’s-bane ornamentals and other yellow daisies are lookalikes. A homeopathic product and a herbal extract also differ markedly in composition.
Medicinal Uses & Benefits
Traditional herbal context
External arnica preparations have a European herbal tradition for bruising, sprains and minor muscle complaints on intact skin. Traditional use does not establish that a bruise has no fracture, bleeding disorder or other cause requiring assessment. Oral herbal use is not recommended.
Scientific evidence and limitations
Evidence for particular topical arnica products is mixed and formulation-specific. Highly diluted homeopathic preparations cannot be used as evidence for a concentrated herbal extract, or vice versa. This draft does not establish a safe internal dose or a general post-operative treatment.
Preparations & Recipes
Plant part and practical preparation scope
Use only an appropriately labelled external product on intact skin when suitable. Do not ingest flowers, brew tea, take homemade tincture orally or prepare a concentrated extract. No homemade salve recipe or dilution is cleared here; a “natural” formula can still irritate or deliver an unsafe exposure. Follow the exact product label and stop if a rash develops.
Medicinal quantities and storage boundary
No independently source-checked medicinal dose, preparation ratio, timing or homemade preparation shelf life is provided. Where a commercial product or established food recipe is mentioned, use its own instructions; forms are not interchangeable.
Safety & Contraindications
Existing catalogue safety warning
Do not ingest; avoid broken skin
Plant-specific precautions and interactions
Herbal arnica is toxic if swallowed. It can cause allergic contact dermatitis, especially in people sensitive to Asteraceae plants. Avoid broken skin, mucous membranes and eyes. Avoid medicinal use in pregnancy or breastfeeding without qualified advice; child use needs a product-specific assessment. Large, unexplained, worsening or persistent bruises and suspected fractures require medical care.
Spiritual & Historical Uses
Historical and cultural context
Mountain-herb and European household-remedy histories are often attached to arnica, but a specific regional spiritual account has not been checked. Do not claim that altitude, a folk name or a homeopathic tradition establishes clinical effectiveness.
Growing, Harvesting & Storage
Growing
A. montana generally requires an open, cool site and acidic, well-drained soil; it is not an easy substitute for ordinary garden daisies. Obtain propagated, correctly identified stock. Climate suitability and conservation rules need local checking.
Harvesting
Wild populations may be protected or vulnerable. Do not collect from conservation areas or substitute an unidentified yellow daisy. Cultivated flowers still require quality and identity checks; no home medicinal harvesting specification is supplied.
Storage
Keep any dried material clearly labelled “external use only” and separated from teas and food. Commercial topical products must be stored and discarded according to their own labels. Drying does not make ingestion safe.