This perennial herb has been used since medieval times to treat sore throats, wounds, eye and skin problems, heavy menstrual bleeding, diarrhoea, digestive problems, ulcers and inflammation of the urinary tract.
It grows to about 50cm in height and is native to temperate regions in the northern hemisphere.
The leaves, yellow flowers and stems can be used in tea.
The plant is high in antioxidants and has diuretic and anti inflammatory properties.
The plant contains palmetic acid, which is said to help fight skin cancer. It also has silicic acid, which is necessary for healthy nails, skin and hair.