This comprehensive book covers the theoretical and practical aspects of citron trees and fruit. The citron (Citrus medica L.), one of the three primary species ancestral to most citrus types, is used for traditional medicine and is highly revered in the Jewish religion during the Tabernacles feast, referred to by the name 'Etrog'. This book’s three sections address biology (botany, genomics, Chinese and Mediterranean citrons, diseases, pests, and horticulture), tradition (Talmudic discourse, mysticism, medicine, literature, art, food, and beverages) and history (archaeology, trade, grafting controversies); these sections are supplemented by a glossary and pictorial album.