The bloom is off echinacea's rose. The herbal remedy for colds hasn't looked so promising in recent clinical trials.
D002986:Clinical Trials as Topic; D003139:Common Cold / Q000188:drug therapy*; D020900:Echinacea; D006801:Humans; D008517:Phytotherapy; D012075:Remission, Spontaneous; D017211:Treatment Failure