Onion
Scientific Name: Allium cepa
Botanical and Historical Origin
Central Asia. One of the oldest cultivated crops in human history.
Evolution of Historical Use
In the Middle Ages, they were used as currency and wedding gifts. Colonial American physicians used onion poultices as a standard treatment for pneumonia.
Traditional Cultivation and Harvesting
Grown from seeds, sets, or transplants. Requires consistent moisture and high sulfur content in soil for the characteristic pungency.
Historical Medicinal Profile
Historical Internal Use
colds, chest congestion (syrup)
Historical External Use
drawing poultice for boils
Safety and Modern Toxicology
Safe for humans. Toxic to dogs and cats.
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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