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This video explores the hidden history of the black walnut tree (Juglans nigra) and its long reputation for being “poisonous.” Blending environmental history with botanical science, it traces how farmers, gardeners, doctors, and naturalists have understood and feared this tree’s toxic effects, from juglone and allelopathy in the soil to its use in traditional medicine and pest control. The documentary looks at how black walnut shaped settlement patterns, land use, and agriculture in North America, and why it earned such a powerful place in local folklore and rural life. Drawing on historical documents, early agricultural manuals, medical texts, and modern research, the video shows how ideas about the dangers of black walnut evolved over time. It follows the tree from Indigenous uses and early colonial accounts through 19th‑century farm journals and 20th‑century horticultural advice, revealing how a single species became both a valuable resource and a feared presence on the landscape.