Identification
Common names: Poison Ivy. Scientific name: Toxicodendron radicans. Family: Anacardiaceae.
Three-leaflet vine/shrub with variable form and urushiol-containing tissues. Always verify leaf, stem, flower, and growth habit together before forage, browsing, or harvest decisions.
Habitat and Range
Fencerows, woodland edges, old structures, and disturbed margins. In TN/KY transition farms, localized moisture and disturbance shifts can change where this plant appears year to year.
Adaptable in sun or shade with strong edge persistence. Match these site preferences to paddock pressure and rotational timing for practical control or utilization.
Ecological Role
Wildlife-use species but major contact hazard for people and animals. Ecological behavior directly impacts pollinator support, forage composition, and long-term weed management labor.
Agricultural and Homestead Value
No meaningful forage value in managed livestock systems. Practical value depends on livestock class, season, and total feed context rather than one plant in isolation.
Forage and management tags: contact hazard plant.
Toxicity and Animal Interaction
Toxicity level: High contact hazard. Urushiol causes severe dermatitis and can spread via tools, clothing, smoke, and pet coats. Chemistry context: Urushiol catechol compounds drive contact toxicity profile..
Animals affected or monitored: dogs, cats, horses, humans. Symptoms to watch: contact rash, skin inflammation, eye irritation.
Veterinary Response Notes
For severe exposure involving eyes or breathing pathways, seek medical/veterinary care immediately. If a herd event is active, preserve samples and timeline details for your veterinarian.
Historical and Cultural Uses (Archive Context)
Historically recognized as a major irritant hazard species. Historical references are archival context, not modern treatment protocols.
Historical remedy tags: none prominent.
Foraging and Cultivation Guidance
Never forage or use as feed.
Do not cultivate; remove with strict protective protocols and no burning.
Codex Navigation
Categories: toxic plants, vines, wild plants.
Use the Plant Codex hub, symptom index, and historical remedy index.
Related Triple 5 resources: Homestead Codex, Animals from Triple 5, Farm Goods, and Farm Experiences.
Source Reference Appendix
This page is a practical synthesis for farm decision-making. It does not replace veterinary diagnosis, extension consultation, or emergency response.
Entry lookup terms: Poison Ivy; Toxicodendron radicans.