(Juglans nigra) Or American Walnut. It is said in America that no plants will grow in the shade of a Black Walnut. Some research has been done on this, and it seems that the roots do secrete some substance harmful to other plants (Baker. 1977). The leaves, too, will keep away house-flies (Bergen. 1899). A dozen or so of these leaves boiled in a quart of water, with a teaspooon of sulphur added, is an Alabama eczema cure (R B Browne), and rubbing ringworm with the inside of a green walnut will cure it, according to Illinois practice (Hyatt). One other belief, once common in Missouri, is that a walnut carried in the pocket will prevent rheumatism (Bergen. 1899).
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