Growing coneflowers (Echinacea spp.) is the easiest way to ... favor single-flower varieties over their ruffled or pom-pom double-flower brethren. That's because when a coneflower has more petals ...

More research is needed to clarify the timing and dosage of echinacea that is most effective for combating the common cold and respiratory infections. Chronic inflammation, the low-grade type ...