Definition of Nippon daisy in US English:

Nippon daisy

(also Nippon chrysanthemum, Nippon oxeye daisy)

noun

US
  • A hardy, shrubby chrysanthemum native to Japan, Nipponanthemum nipponicum, having flowers with white ray florets and greenish-yellow discs, and grown as an ornamental perennial, especially in Japan and the U.S.

Origin

1930s.