Motherwort (Leonurus cardiaca) is a flowering plant in the mint family, Lamiaceae. Other common names include Throw-wort, Lion's Ear, and Lion's Tail. The latter two are also common names for Leonotis leonurus. Originally from Central Asia it is now found worldwide, spread largely due to its use as a herbal remedy.

L. cardiaca has a square stem and opposite leaves. The leaves are palmately lobed; basal leaves are wedge shaped with three points and while the upper leaves are more latticed. Flowers appear in leaf axils on the upper part of the plant and it blooms between June - August. The flowers are small, pink to lilac in colour often with furry lower lips. The plant grows to about 60-100 cm in height. It can be found along roadsides and in vacant fields and other waste areas.

Medicinal Uses

Motherwort has a long history of medicinal use originating in Central Europe, Asia and North America. It is very useful for a variety of ills, and is very nourishing, much like stinging nettle or dandelion. The herb contains the alkaloid leonurine, which is a mild vasodilator and has a relaxing effect on smooth muscles. For this reason, it has long been used as a cardiac tonic, nervine, and an emmenagogue.