Its price increased due to high demand, leading to it being worth "more than its weight in silver" by the 1st century BC. The high demand eventually led to the extinction of Silphium during the 3rd or 2nd century BC.[7] Asafoetida, a close relative of siliphion, was also used for its contraceptive properties. Other plants commonly used for birth control in ancient Greece include Queen Anne's lace (Daucus carota), willow, date palm, pomegranate, pennyroyal, artemisia, myrrh, and rue.