Echinacea is a perennial, long-lived plant with quite large wonderful pink or purple flowers, that are 4-6 inches in diameter. The flower-head has a stiff cone-shaped center, which is actually, composed of tiny brownish-red individual flowers, with seeds being formed inside. Each flower-head is placed on a separate long, strong, erect stem, which reaches the height of about 4 feet. The plant prefers dry soils, being afraid of too much moisture. Sunny locations are the best for Echinacea. However, the herb is strong enough to stand harsher conditions.
Echinacea History and Description - chinese-herbs.org, http://www.chinese-herbs.org/echinacea/ (accessed January 27, 2017).