Echinacea is a Northern American native coneflower and is classified as an herb. It has many uses. Most commonly, it is used for colds and cases of flu, which is why we can buy echinacea in almost all stores in a tincture, tea, and as a supplement. 
“Echinacea stimulates the overall activity of the cells responsible for fighting infection and makes our immune cells more efficient at attacking bacteria and viruses. It is known to shorten the duration of colds and flu.” Grow Forage Cook Ferment
According to some studies, echinacea has many other benefits. 
Helps combat cancer
Alleviates pain
It is a mild laxative
It helps treat urinary tract infections
Treats skin problems
Improves mental health 
Throughout history, people have used echinacea to fight infections. Echinacea plants are found in many herbal gardens. If you grow your own echinacea, you can harvest the flowers, leaves, and roots to make herbal extracts and teas.