A robust herb. It keeps growing from year to year and is 2.5 m tall. The leaf stalk is 3-8 cm long. The leaves are oval or triangle shaped and 10-40 cm long. They are divided one or two times into leaflets. The leaflets are 5-13 cm long by 1-6 cm wide. The main leaf axis is bent and the leaflets are bent back. The flowers are white and in flat topped heads.