The Purple Coneflower (Echinacea purpurea) has large, lavender flowers with a spiny, dome-shaped, orange or brown center. Its stems have small, rough hairs. Flowers bloom in early summer, usually in June to July. Purple Coneflower grows 30 to 90 cm tall. Echinacea, is an herbal medicine that has been used for centuries, customarily as a treatment for the common cold, coughs, bronchitis, upper respiratory infections, and some inflammatory conditions. Research on echinacea, including clinical trials, is limited and largely in German.