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