The pyrethrum, Jyochu-Giku in Japanese, was designated the flower of the former Innoshima City in 1983.
It is a perennial plant belonging to the Asteraceae family that grows to about 60cm and blooms with a row of white petals at the end.
Pyrethrum was once cultivated as an ingredient in mosquito coils and other products, and by May Innoshima would be covered in pure white.