Black Walnut
Scientific Name: Juglans nigra
Botanical and Historical Origin
Native to eastern North America.
Evolution of Historical Use
The transition of this material from a wild-crafted curiosity to a staple of the household medicine chest reflects the broader evolution of folk medicine and the sharing of knowledge across frontier communities.
Traditional Cultivation and Harvesting
Traditionally, this material was wild-harvested at the peak of its seasonal potency—often determined by local folklore or lunar cycles. In farmstead gardens, it was cultivated in rich, disturbed soils near the homestead for immediate access.
Historical Medicinal Profile
Historical Internal Use
parasites, fungal infections
Historical External Use
ringworm, iodine-like wash
Safety and Modern Toxicology
Contains juglone. Can be harsh on the liver and kidneys. Avoid in pregnancy.
Circular Codex References
This ingredient is also documented in our livestock-focused Plant Codex, where you can find detailed information on its identification, veterinary safety, and farmstead management.
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