Calea zacatechichi - A perennial shrubby herb from Central America and Mexico, used there for medicinal and ritual purposes. It is said to induce lucid dreams. Full sun to part shade.An attractive tree in the garden, flowering most of the year in the right climate. Not frost hardy, but growing really well for me here in an unheated greenhouse. Once a sacred plant to the ancient Aztecs. NB- this plant can have serious side affects.