Acmella oleracea is a native to the tropics of Brazil, where it is called Jambu, and is grown as an ornamental and as a medicinal plant in various parts of the world. A small, erect plant, it grows quickly and sends up gold flowers with a red centre. Both fresh and cooked leaves are sometimes used in stews but eating a whole flower bud results in a grassy taste, followed by an extremely strong tingling or numbing sensation. These buds are known as Buzz Buttons or electric buttons and the numbing effect helps toothache. Best grown as a tender annual in the UK.