Among these are&colon; tansy, pennyroyal, black cohosh, and the now-extinct silphium. Crushed pennyroyal leaves emit a very strong fragrance similar to spearmint. In the cold season, they add many warming herbs like pennyroyal mint and wormwood. The lower concentration of toxic chemicals in these teas are less harmful than pennyroyal oil. Early settlers in colonial Virginia used dried pennyroyal to eradicate pests. There is no known antidote for pennyroyal toxicity. Consumption of pennyroyal tea can be fatal to infants and children. He sang the songs School, Pennyroyal Tea and Drain You. The most concentrated and toxic form of the pennyroyal plant is pennyroyal oil. The "Pennyroyal Tea" single was recalled shortly after Cobain's death in April 1994. Tom confronts Pennyroyal, who knows that Hester sold Anchorage to Masgard, but doesn't tell Tom. It is very closely related to the "real" pennyroyal. The airship downs near Fang's old home, where Hester and Tom leave Pennyroyal. The active chemical in pennyroyal is pulegone. It is located in the Pennyroyal Plateau and Western Coal Fields regions.