Echinacea. Echinacea (Echinacea angustifolia, Echinacea pallida, Echinacea purpura), a relative of the ragweed plant, is used to treat the common cold and influenza. []Evidence obtained in vitro ...

Who doesn't love the whimsical blooms of coneflower (Echinacea angustifolia), with their downward growing petals and upright central cones? This perennial is hardy in USDA zones 3 through 8, and apart ...