The case of Soma shows how a psychoactive plant was regarded as a God, inspired a mythology, and became a ritual. When the original Soma of the Rigveda became difficult or impossible to procure, Vedic peoples constructed a ritual edifice of unprecedented complexity, combining rites with chants and recitations. It happened around 1000 B.C., when their sociopolitical center shifted from the Indus Valley to the Kuru region near modern Delhi, between Indus and Ganges, where most of the other three Vedas were composed. The entire development demonstrates how ritualization increases as Soma decreases. I have paid attention to the identity original location since these explain ritualization.