JUGLANS REGIA L. (JUGLANDACEAE) — English Walnut, Carpathian or Persian Walnut

This chapter provides information on the uses, folk medicine, chemistry, germplasm, distribution, ecology, cultivation, harvesting, yields, energy, and biotic factors of English Walnut. The English walnut is a folk remedy for anthrax, asthma, backache, caligo, chancre, colic, conjunctivitis, cough, dysentery, eczema, ejaculation, favus, heartburn, impotence, inflammation, intellect, intestine, intoxication, kidney, legs, leucorrhea, lungs, rheumatism, scrofula, sore, syphilis, and worms. English walnut is reported to tolerate frost, high pH, heat, insects, low pH, and slope. Varieties are selected on basis of high heat tolerance, resistance to walnut blight, tolerance for winter cold, and yield and quality of kernels. Seedlings are very susceptible to mushroom root rot, and Walnut girdle disease &s;Blackline&s; is thought to occur when certain horticultural varieties of Juglans regia are grafted on rootstocks of Juglans hindsii and its hybrids, associated with graft incompatibility.